GPR help

[mpage18]

so i put a new gpr yesterday and left my truck unplugged last night ( wasnt even cold) and she was hard to crank this morning. its really pissing me off. when i get in my truck i want it to crank. what else should i check? its a early 99 truck ..

[justinlogue5_0]

This will get you started
Troubleshooting GPR & GP's

[justinlogue5_0]

After reading that let me know if you have any more questions.

[mpage18]

i dont have a volt meter with me because im at school right nowso cant check to see if the glow plugs are bad( have one at home) and wont be back home for a few days. what if it is this" your problem is in the PCM circuit that tells the GPR to activate". ? thanks for the help

[justinlogue5_0]

Its almost never that but in the 1 and a million chance that it is you have about two choices. Get a new/used pcm OR hook up a push button switch so you can manually energize the relay. Leave them on for about 1 minute tops and then crank. You really need a volt meter (15.00 wal mart special) because even your new relay could have been a bad one.

[mpage18]

ok well i went and got me a volt meter and pulled the plug to check the glow plugs and i cant get it to read anything on the meter? any ideas im prob doing something wrong

[mpage18]

and the gpr is only reading .03 and i tried it a few different times same thing everytime

[justinlogue5_0]

The two large plugs on the relay. One should have at least 12v all the time since its hooked straight to the batterys. The other large plug should have minimum of 11v when you turn the key to the key all the way on engine off position. If you did it this way and you are only getting 3v then that relay is toast.

[mpage18]

ok so my relay is toast. one post has 12 volts and the other has 3. and i just took back the new gpr because it really didnt make a difference this morning ( bearly got it cranked) andd it was 80 bucks so ill go get one of the $20 ones from napa.

[justinlogue5_0]

Good luck I think the napa is #109? Any relay at this point will be good for you. You can always beef it up later down the road. You just got to get it working first.