Medium and Heavy Trucks

Have truck repair questions? Ask an Expert

Ask an Expert,
Get an Answer ASAP!

This answer was rated:

Carrier Transicold Supra 744 It looks like RR relay is Not…

Carrier Transicold Supra 744 It looks...
Carrier Transicold Supra 744
It looks like RR relay is Not sending power to DER relay so fuel pump is not turning on
board 12-00460-2
Show More
Show Less
Ask Your Own Medium and Heavy Trucks Question
Answered in 15 minutes by:
3/21/2018
Wayne
Wayne, Journeyman
Category: Medium and Heavy Trucks
Satisfied Customers: 11,299
Experience: worked on, Gmc, Macks, Freight liner,Mercedes Benz,,Ford, sterling
Verified

Hi Dean

I’m Wayne.

I will be assisting you with this issue today.

when you say DER , defrost relay ??

Wayne

Ask Your Own Medium and Heavy Trucks Question
Customer reply replied 4 months ago
diesel electric relay

Hi

Thank you for that

did you check the fuses ?? on the board ??

Wayne

Ask Your Own Medium and Heavy Trucks Question
Customer reply replied 4 months ago
all fuses good
The RR relay is not energizing
ground at relay switch off switch on ground disappears
so no 12volt feed to to DER

HI Dean

Thank you for that

run a temp ground to the relay terminal

it should start, let me know

Wayne

Ask Your Own Medium and Heavy Trucks Question
Customer reply replied 4 months ago
The unit will run with temp ground is there a safety switch that is killing relay

Hi

Yes, low oil pressure switch, High pressure cut out (HPCO) switch

the HPCO is on the compressor, unplug it and jump the wires

and same as LOP switch, 1 at a time to find the faulty one

I hope this helps you

Wayne

My goal is to give you the best experience possible.

I hope that I have earned a 5-star rating

Found at the top of the screen before you leave today.

If you need more assistance, please use the reply box and let me know.

Ask Your Own Medium and Heavy Trucks Question

Morning

Just following up with you

Did my answer help you

Wayne

Ask Your Own Medium and Heavy Trucks Question

Morning

I took the time to answer your question

Please take the time to respond to me

Wayne

Ask Your Own Medium and Heavy Trucks Question
Customer reply replied 4 months ago
Had some snow this week so will get to look at it today

OK

Thank you

Keep me posted

Wayne

Ask Your Own Medium and Heavy Trucks Question
Customer reply replied 4 months ago
Both switches seem to be working I need to see where they go so I can check wiring.
Did conductivity on switches..

Ok

Keep me informed

Wayne

Wayne
Wayne, Journeyman
Category: Medium and Heavy Trucks
Satisfied Customers: 11,299
Experience: worked on, Gmc, Macks, Freight liner,Mercedes Benz,,Ford, sterling
Verified
Wayne and 87 other Medium and Heavy Trucks Specialists are ready to help you
Ask your own question now
Customer reply replied 4 months ago
Wires are good to plugs (plug to plug) put ground to rr relay unit operates fine .
where dose ground for that relay come from (Run Relay)

Hi

Let me dig out my electrical book

Wayne

Ask Your Own Medium and Heavy Trucks Question

Hi

it comes from the CH terminal

on the PC board

Wayne

Ask Your Own Medium and Heavy Trucks Question
Customer reply replied 4 months ago
do you have schematic on mp and pc boards

Hi

I have the book on Mp 1V

Wayne

Ask Your Own Medium and Heavy Trucks Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a technicianLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Wayne Your Own Question
Wayne
Wayne
Wayne, Journeyman
Category: Medium and Heavy Trucks
Satisfied Customers: 11,299
11,299 Satisfied Customers
Experience: worked on, Gmc, Macks, Freight liner,Mercedes Benz,,Ford, sterling

Wayne is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here.

DianeDallas, TX

< Previous | Next >

Meet the Experts:

Daniel Wilson

Daniel Wilson

2,803 satisfied customers

Owner at DJ Wilson

Cat Man

Cat Man

Cat Engine Expert

4,530 satisfied customers

I am ASE Master Truck Certified.

Wayne

Wayne

Journeyman

11,299 satisfied customers

worked on, Gmc, Macks, Freight liner,Mercedes Benz,,Ford, sterling

Jeremy

Jeremy

Certified Truck/Bus Technician

2,243 satisfied customers

ASE Med/HD Truck Technician, NATEF Diesel Engines and Electrical/Electronics Technician, EPA 608/609 HVAC Certified, Steering/Suspension and ABS/Brakes Technician

cumminsdr

cumminsdr

Mechanic

1,351 satisfied customers

All types of Cummins applications

Curtis B.

Curtis B.

Technician

991 satisfied customers

Technician turned service manager on multiple lines of trucks and engines, used in industry.

dieseldan55

dieseldan55

Contractor

74 satisfied customers

Road Service mechanic for Volvo Construction.

< Previous | Next >

Related Medium and Heavy Trucks Questions
My 2005 apu will not crank. the display has no codes.the
my 2005 apu will not crank. the display has no codes.the buzzer comes on for glow plugs and doesn't stop, and doesn't start. … read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
11,299 satisfied customers
I have a 1999 lx885 new holland i have no power to fuel
i have a 1999 lx885 new holland i have no power to fuel pump … read more
Curtis B.
Curtis B.
Technician
Associate Degree
991 satisfied customers
No power to thermo tripak apu at the control panel. shut off
no power to thermo king tripak apu at the control panel. shut off now no lights. checked the 50 amp fuse at battery box it's ok. not sure what else could be wrong. … read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
11,299 satisfied customers
Pre egr cummins isx 450hp lift pump not coming on, I have a
Pre egr cummins isx 450hp lift pump not coming on, I have a new pump and plugged it in but not installed, did not come on either. Where is the fuse? I've untied the harness on the ecm side if the engi… read more
Andy3221
Andy3221
truck /coach technician
Vocational, Technical or Trade Scho
222 satisfied customers
I have a Carrier comfort pro APU and in the top right hand
I have a Carrier comfort pro APU and in the top right hand corner of the driver's control panel is a lightning bolt with off I have no AC no heat and no electric but the generator charges the batterie… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
11,299 satisfied customers
I have a Thermoking Tripac evolution not starting, it cranks
I have a Thermoking Tripac evolution not starting, it cranks but won't start also I removed the hose going to the filter housing when I turn the controller on the lift pump starts sending fuel but as … read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
11,299 satisfied customers
I need a complete electrical schematic on a 97 international
Hi,i need a complete electrical schematic on a 97 international 4700 with a 466 dt engine.I hit a pot hole & it knock the truck off.A Diesel mechanic was able to get it to turn over again but he said … read more
Alex Olsen
Alex Olsen
auto/diesel/industrial
488 satisfied customers
I have fault codes in ford 5.9 cummins, codes 233 and 251 't
codes 233 and 251 don't know what they mean my books don't show them and need help trouble shooting … read more
cumminsdr
cumminsdr
Mechanic
High School or GED
1,351 satisfied customers
I have an older apu. Apu won't start. Inverter has a code
I have an older apu. Apu won't start. Inverter has a code (305) and an audible alarm, hmi is showing nothing. Main power comes on on hmi but I can not get apu power button or controls to function. All… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
11,299 satisfied customers
I have a box refer truck with a Carrier Transicold control
I have a box refer truck with a Carrier Transicold control unit mounted on dash. It has numerous functions on it such as a button for road one for city manual def. Under the flip up visor there is a f… read more
Andy3221
Andy3221
truck /coach technician
Vocational, Technical or Trade Scho
222 satisfied customers
ford f650 6.0: I have a 06 ford f650 6.0 turbo diesel i replaced
I have a 06 ford f650 6.0 turbo diesel i replaced the electric fuel pump and it still does not come on to prime system i have no schematic and dont no witch relay to ck or where it is please help Ron… read more
Andy3221
Andy3221
truck /coach technician
Vocational, Technical or Trade Scho
222 satisfied customers
06 international isx, cranks wont start, gauges cycle then
06 international isx, cranks wont start, gauges cycle then they max out like it is shorted out some where, fuses good, power to ecm, not to lift pump… read more
Travis A. Wells
Travis A. Wells
Truck Mechanic
Associates of Applied Science
4 satisfied customers
Chevrolet c7500: WE HAVE A 2005 GMC C7500 THAT BOTH THE BRAKE
WE HAVE A 2005 GMC C7500 THAT BOTH THE BRAKE INDICATORS ARE ON, NO ABS LIGHT BUT BRAKE LIGHT ON DASH AND CENTER CONSOLE ON, WE HAVE REPLACED BRAKE LIGHT SWITCH AND RELAY FOR ELECTRIC BOOSTER MOTOR, OL… read more
Andy3221
Andy3221
truck /coach technician
Vocational, Technical or Trade Scho
222 satisfied customers
I have a Carrier Transicold 750 on a 2008 International. A
I have a Carrier Transicold 750 on a 2008 International. A year ago it was working fine. Then intermittently it wouldn't start and the engine oil alarm would come on. The oil level is fine. All my bat… read more
tkman55
tkman55
Owner 24 HR Mobile Service TK/Carrier
55 satisfied customers
Hellow my diesel expert.I have 2006 mitshibishi fuso fe 180
Hellow my diesel expert. I have 2006 mitshibishi fuso fe 180 truck. Engine model Fe850dg-D10088 Problem car wont start. turn key on grow plug green sign not on dash board. Engine is crank but not star… read more
Andy3221
Andy3221
truck /coach technician
Vocational, Technical or Trade Scho
222 satisfied customers
GMC 8500: Iam working on a 2007 GMC 8500 truck with a 8.1 litre
Iam working on a 2007 GMC 8500 truck with a 8.1 litre engine. it will crank up and run until the wait to start indicator comes on flashing,then it will shut the engine off by killing the volts to the … read more
spankyjr1
spankyjr1
Retired
Vocational, Technical or Trade Scho
19 satisfied customers
2005 carrier supra 744 will not shut down right away after
2005 carrier supra 744 will not shut down right away after turning it off. It will turn off long after. What can this be?… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
11,299 satisfied customers
Have a Carrier Transicold Unit that is losing power to fuel
Have a Carrier Transicold Unit that is losing power to fuel shutdown solenoid.Checked allfuses, ok. Pull solenoid out a little bit and unit runs. Possible bad solenoid. Dealer says they don't go bad?… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
11,299 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x