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sprinkles08
sprinkles08, ASE Certified Technician
Category: Jeep
Satisfied Customers: 22646
Experience:  Chrysler/Dodge/Jeep Master Certified, ASE Master and Advanced Certified, Trans and Hybrid Specialist
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My alarm system is draining my battery and wont let it run,

Customer Question

my alarm system is draining my battery and wont let it run
JA: Have you tested the battery with a voltmeter? And can you see if it's leaking or not?
Customer: I changed the battery
JA: What is the model/year of your Jeep?
Customer: 96 jeep grand cherokee laredo
JA: Are you fixing your Grand Cherokee yourself? What have you tried so far?
Customer: I changed the starter and fuses and i tried the door and key thing a few times but nothing and when the alarm isnt going off my jeep wont start up
JA: Anything else you want the mechanic to know before I connect you?
Customer: It sounds like its not getting enough fuel and ive been told i might need a new fuel pump and i just wanna knlw if there is anything else i ahould fix before i can start this thing
Submitted: 8 months ago.
Category: Jeep
Expert:  david craig replied 8 months ago.

Hi Im David, whats the battery voltage reading while the engine is running?

Customer: replied 8 months ago.
I don't know
Expert:  david craig replied 8 months ago.

could you please find out for me?

Customer: replied 8 months ago.
how
Expert:  david craig replied 8 months ago.

have the vehicle jump started let it run a minute then take the jumpers off and read the voltage at the battery with a meter

Customer: replied 8 months ago.
The jeep doesnt run it starts to turn over but doesnt ive put a new battery starter ans fuses ans fuel filter plus braking things like rotors calipers and pads but thats for when i finally get my baby running, i need help getting this damn thing running amd idk what to do or fix if u can point me in the right direction please
Expert:  david craig replied 8 months ago.

ok, well you didnt mention that it wouldnt start even with out a jump.

Expert:  david craig replied 8 months ago.

when you try to crank it does the security light go out?

Customer: replied 8 months ago.
The light for security doeant come on but the headlights flicker and there a ticking coming from inside
Expert:  david craig replied 8 months ago.

does it come on at all?

Customer: replied 8 months ago.
When i attempt to turn on my jeep it starts to turn on but it didn't turn fully over, usually in this situation u think maybe press the gas cause it sounds like It need a lil to turn on but when i do it has a major blowback nd it doesnt turn on its sounds like it wants to turn on but never gets there
Expert:  david craig replied 8 months ago.

ok. let me dig into this

Expert:  david craig replied 8 months ago.

when you turn the key to the run position can you hear the fuel pump running for a few seconds?

Customer: replied 8 months ago.
Can u explain? Cause im not sure what that sound is
Expert:  david craig replied 8 months ago.

do you have someone with you?

Customer: replied 8 months ago.
No
Expert:  david craig replied 8 months ago.

ok. sitting in the jeep. turn the key to the on position(not start), listen very closely for a low humming noise coming form back where the fuel tank is. it should only last 2-3 seconds

Customer: replied 8 months ago.
What if i dont hear it?
Expert:  david craig replied 8 months ago.

that means the fuel pump isnt working

Expert:  david craig replied 8 months ago.

we need to check some fuses and relays

Expert:  david craig replied 8 months ago.

let me get you a print and a pic

Expert:  david craig replied 8 months ago.

is that a 4.7?

Customer: replied 8 months ago.
4.0 v6
Expert:  david craig replied 8 months ago.

thanks

Expert:  david craig replied 8 months ago.

havent forgot about you

Expert:  david craig replied 8 months ago.

pull the fuel pump relay out. do you have a meter?

Expert:  david craig replied 8 months ago.

location

Customer: replied 8 months ago.
Meter like voltmeter?
Expert:  david craig replied 8 months ago.

yep

Customer: replied 8 months ago.
Yea i have one nd what do u want me to do?
Expert:  david craig replied 8 months ago.

pull the fuel pump relay. key off find 12vdc in one of the holes

Expert:  david craig replied 8 months ago.

hello???

Customer: replied 8 months ago.
Currently not able to remove tank cause the bolts r rusted nd i broke my socket so now i have to wait...how do i disconnect the alarm system cause thats still a problem
Expert:  david craig replied 8 months ago.

why are you pulling the tank? we need to test the relay first

Customer: replied 8 months ago.
To replace the fuel pump? The relay is fine
Expert:  david craig replied 8 months ago.

how do you know the relay is fine?

Expert:  david craig replied 8 months ago.

how do you know that jumping 12volts on the relay base wont turn on the fuel pump?

Customer: replied 8 months ago.
how do we jump 12 volts?
Expert:  david craig replied 8 months ago.

pull the relay out. take the meter and find 12vdc in one of the holes. let me know when you get to that point

Expert:  david craig replied 8 months ago.

checking in to see how its going

Expert:  david craig replied 8 months ago.

hello??????????

Expert:  david craig replied 8 months ago.

do you still need assistance?

Expert:  sprinkles08 replied 8 months ago.

Hello and welcome to JustAnswer!

It sounds like you may have a couple different issues going on. Factory security will allow the engine to start, run for about one second and then shuts the injectors off. It sounds like security may need to be disarmed but there may also be a deeper issue.

Can you elaborate on what you mean by 'major blowback'?