Medium and Heavy Trucks

Have truck repair questions? Ask an Expert

Connect one-on-one with {0} who will answer your question

Related Medium and Heavy Trucks Questions
I have a 3126 cat I'm trying to start but I need wiring
I have a 3126 cat I'm trying to start but I need wiring diagram for ecm connector on truck side … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
4,530 satisfied customers
2002 gmc series with cat 3126b. tachometer not working
2002 gmc b series with cat 3126b. tachometer not working already replaced alternator, repaired cluster, run straight wire from alternator to cluster but still tach not working… read more
Steven
Steven
Triage Tech/Shop Foreman
Associates
11 satisfied customers
I have a 3126 cat in a 7500 Chevy, drove to work just fine
I have a 3126 cat in a 7500 Chevy, drove to work just fine then when I tried to leave the starter ingauged but died. Now I have power when I turn my switch on and my chassis are clicking but no power … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
4,530 satisfied customers
Just bought a 1999 c6500 with cat 3126 and at545. it was
good day, just bought a 1999 c6500 with cat 3126 and at545. it was rigged with a push button to crank, ick. have made progress but cant identify what steering column wires should be doing what. in par… read more
Daniel Wilson
Daniel Wilson
7,511 satisfied customers
I have a gmc 7500 with a cat that has a electrical problem
I have a gmc 7500 with a cat that has a electrical problem to the engine. Do you have a real good gmc mechanic available at this time. … read more
Daniel Wilson
Daniel Wilson
7,511 satisfied customers
2002 GMC 7500 7.2 DSL, with CAT 3126, flashing MIL, Code 58,
2002 GMC 7500 7.2 DSL, with CAT 3126, flashing MIL, Code 58, loss of power, where do we go from here?… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
4,530 satisfied customers
1999 chevy c6500 with 3126 cat no start no check engine
1999 chevy c6500 with 3126 cat no start no check engine light with key cycled where is the pc fuse/ circut braker… read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Associate Degree
3,989 satisfied customers
I have a 2003 GMC 7500 with a 3126 cat, truck came in no
Hello, I have a 2003 GMC 7500 with a 3126 cat, truck came in no start no crank, could not communicate with ecm, checked power and grounds found all ok, replace ecm, now I can communicate with ecm and … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
4,530 satisfied customers
I have a 2000 GMC T7500 with a cat 3126, no start. I have no
I have a 2000 GMC T7500 with a cat 3126, no start. I have no check engine light when key is turned on, and I have no power at pin 70. The two battery pins show power, not sure where pin 70 gets its po… read more
Daniel Wilson
Daniel Wilson
7,511 satisfied customers
I installed a different ECM on my 3126 cat and it still
I installed a different ECM on my 3126 cat and it still reads no ECM detected on scanner, just wondering what pins go to plug underneath the dash… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
4,530 satisfied customers
Working on a 1994 Frieghtliner 1FUYDEDB8RH557066 cruise
working on a 1994 Frieghtliner 1FUYDEDB8RH557066 cruise control not working, getting power to on off switch until you turn switch on then you lose power like it's grounding out, replaced on/off switch… read more
FIX-IT
FIX-IT
Comercial transport technician
Vocational, Technical or Trade Scho
829 satisfied customers
2001 GMC T8500 with CAT 3126, intermittent check engine
2001 GMC T8500 with CAT 3126, intermittent check engine light, engine loss of power after running for aprox 1 hours. Can not connect with Prolink Ultra, can not see any modules on the network. No wiri… read more
Daniel Wilson
Daniel Wilson
7,511 satisfied customers
3126 cat in a 1999 GMC topkick C6500, I made a swap and I
3126 cat in a 1999 GMC topkick C6500, I made a swap and I need the full ecu wiring, … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
4,530 satisfied customers
1999 GMC C7500 3126 Cat. Occasional hard start. "No ECM
1999 GMC C7500 3126 Cat. Occasional hard start. "No ECM detected" when hooking up scanner.… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
4,530 satisfied customers
GMC 6500: I HAVE A 1998 GMC 6500 WITH A 3126 CAT ENGINE. NO
I HAVE A 1998 GMC 6500 WITH A 3126 CAT ENGINE. NO POWER TO STARTER FROM SWITCH,POWER COMING OUT OF NEUTRAL SAFETY SWITCH.… read more
Daniel Wilson
Daniel Wilson
7,511 satisfied customers
I have a 2000 chevy c6500, the tachometer not the speedometer
I have a 2000 chevy c6500, the tachometer not the speedometer doesn't work. The alternator has change, the instrument cluster been rebuild and the sensor in transmission has been change. What should I… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
4,530 satisfied customers
2004 freightliner FL70 with cat engine with no crank has battery
2004 freightliner FL70 with cat engine with no crank has battery voltage replaced start solenoid… read more
dieseldoctorkev
dieseldoctorkev
power system tech 1
76 satisfied customers
3126 cat. is the two prong wire connection on the injection
3126 cat. is the two prong wire connection on the injection actuation pressure censor have power in it with switch on.… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
4,530 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.

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

7,511 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

2,892 satisfied customers

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

Jeremy

Jeremy

Certified Truck/Bus Technician

3,989 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 >

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