40 amp ignition fuse blew. I replaced the fuse and now the lights all go on when the key is turned on but the vehicle will not start...or even try to start. The battery is fully charged.
The 40 amp maxi fuse in the underhood junction block (According to the information I have, there is only one 40 amp fuse in there..) goes directly to the ignition switch. From there, it goes to the buss bar in the Instrument Panel Fuse Block where it feeds several smaller fuses. It also feeds the starter relay in the Underhood Fuse and Relay Center.
My biggest concern would be: What caused the fuse to blow in the first place?
If you get nothing else from my preaching, get this:
Fuses don't blow for no reason....ESPECIALLY not a 40-amp Maxi Fuse!
I can't count how many times I have heard people say: "It's JUST a blown fuse." WHAT???
I have been at this for 35 years and I can tell you that blown fuses are reason for major concern in my book. That 40-Amp Maxi Fuse just saved your truck from burning to the ground and you need to find out why!
The only way that fuse is going to blow is if there is a direct short to ground between the Underhood Fuse and Relay Center and the Instrument Panel Fuse Block (The only "component" between these two is the ignition switch.) or if the secondary side of the starter relay circuit is shorted to ground. The secondary side of the starter relay feeds the "S" terminal of the starter solenoid. (at the starter)
I think the first place I would look for the problem would be the circuit between the starter relay and the starter. It is likely to be shorted against the exhaust or engine block. If this is the case, it most likely fried the starter relay in the process. (which is why the fuse no longer blows and the engine no longer starts)
Aftermarket remote starting units are also usually tied into this circuit. If your vehicle has one of these, it could very likely be the original source of your problem.
At any rate, there should be no rest, truck running or not, until the reason for the blown fuse is found. You will most likely get the truck running in the process of locating the reason for the blown fuse.
Nov 23, 2010 |
1996 Chevrolet Suburban