jeep keeps blowing fuel pump fuse,
replaced all the wires from fuse box back to the pump,
all the relays, all the ground wires, o2 sensor wires.
and still has a short, i know its not the pump because when i dissconnect
it it still says it has a short (using the light bulb as a fuse trick.
theres not many things taht i cant figure out about my jeep, but as far as thus
goes... im about to admit defeat and say the jeep has won... i dont know what to do at this point, ive spent 10 or more hours trying to figure it out,
does any one have advice?
no, a few weeks back i was away for work and my garrage was broken into, so im still
trying to get my collection of tools back.
but does this idea i have make sense...
when i disconnect the harness plug in the center of the engine bay, and i have a light bulb as the fuse ( when it lights up it indicates there is still a short so when i unplug the the harness the light goes out, meaning the short is somewhere to the right of the harness) so i took the light and went to each wire and connected them to each other individually the wire that makes the light go on is the wire with the short....?
when i did that the Red and White wire was the one that made the light turn on, witch when i followed the red and white wire back it lead to the fuel pump fuse...
so now all i need to do is take the wire completly out ( from the fuse box to the computer) and put a new wire in?
I see a couple of wires that are a bit crimped in the background. Leads me to believe there might be more pinched wires somewhere causing the short. Try tracing the wires and looking for any pinch or crimps
91 YJ, 350/700R4/231, 8.8/HPD30 with 3.73s, 6" SOA with 38" TSLs. If I ever see the previous owner again, I am going to curb stomp that meth-head brain dead crackpot.
Please realize that using a bulb and having it light, does not mean you have a short circuit, only thing the bulb needs is a path to ground, which could be through any load device such as your fuel pump which could be functioning normally. A bulb is no way to test for a short circuit, It will light on any healthy circuit than can pass current to ground at some point. You must use a DVM and read resistance to ground. Also, while you are doing this test, is the ignition off? The ASD Relay is in parallel with the fuel pump relay. Both of these are fed off of fuse F1/30amp via the red/wht wire that you mentioned. Please borrow/steal/lease a meter capable of measuring resistance. It is really the only way to test for a short. Lamps are only reliable for testing for the presence of voltage, which you obviously have.