Instrument Cluster Dash Light Does Not Come On All The Time

Okay, we are just going to have to jump back and forth a bit. Fuse number twenty three should be Hot with Key in RUN or START. This power from the ignition switch to the ECM, Fuel pump relay and one other circuit. We may have to go by the VIN number tomorrow, so I can see exactly which model I am looking at here. It seems they changed some of the ECM harness with this production change.

Also need to figure out why number nineteen was blown, There may be a short to ground somewhere here. That fuse did not pop for no reason.

I did a little more research here, I am thinking you may want to have a look behind these fuse panels, both, the one under the driver side dash and the one under the hood if you are up to it. They can get corroded underneath and we need to find why that fuse blew. Check for loose harness plugs under the dash as well, this can be a problem on this vehicle.

We also need to make sure the ignition switch is sending power to the ECM in RUN an START position. So to start with I am sending some diagrams of the ignition switch and what wires to check for power at certain key positions. This should not be too difficult, I am labeling everything for you.

Well that is extremely strange to say the least, If you did not remove it, then I do not know what happened. I just know it powers everything important. Sorry our diagnosis took so long, but that would explain why for sure. Did you get the right size fuse in there I hope? It protects the ECM on the ignition circuit, so it has to be the right amp size. Glad everything worked out good. Took a few days but we figured it out anyway.

Number twenty three fuse should be twenty amp.

Just wondering, did you replace the alternator yourself?

Well if it keeps blowing fuses like that, there is something shorting out to ground or one of the fuse panels may be seriously corroded inside. Kind of strange it is just popping random fuses like that. That is why I suspect a fuse panel, maybe under the hood where it is getting some condensation in it.

Yes, there has to be some power wire touching ground somewhere for fuses to be going that often. And random fuses at that. We can keep digging threw wiring diagrams and replacing fuses, but ultimately you are going to have to find some common place were these fuses are related and see whats going on. Look for exposed areas to the elements, around the battery, any fuse panels under the hood, type places. I can get you anymore wiring diagrams you may need.

Once you find the problem, you probably wont have anymore issues like this for awhile at least. I lived by the ocean so I know what the salt air can do, like I am sure you know as well.