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F150 electrical problem

P

Patsdeere

Well-known Member
I have an old 90 F150 that has been acting up. Last week one day it started fine, I drove a block and it just died dead. Let it sit for about 5 min and it restarted fine and drove fine.

This morning on the way to work it started fine and drove fine, then it all changed. There was a high decibel whirl noise coming from the engine. I also noticed that the charge gauge topped out at the max charge. Also, the little idiot light that looks like a battery came on.

I got it home and borrowed a car to get to work. Any ideas what went caput or is going out? If it is an alternator I would like to get one on the way home so I don't have to borrow the car again.

Thanks - to keep it tractor related it is full of tractor parts.
 
The start, no start syptom may be the ignition module going out. I have a 91 Bronco that would start but quit, or fail to start on account of the module. The module is located on the side of the distributor. No idea about the "whine and overcharge". Email if I can help you any further.
Pete
 
If you're just gonna throw parts, might as well pick up a distributor and ignition coil along with the alternator. My 90 F250 did the start/no start thing and I just replaced the coil and complete distributor and fixed the problem.

Dave
 
Probeably igniton module or coil pickup on dist. is why it quit. Simpler to just buy a whole dist. than to change the parts. The alt could have caused the problem, but I dought it. You could pull thecodes, but your problems dont alwasy show up in codes, and NO, you dont need a code reader for that truck.
 
When the ignition module went out on my truck (88 F150) it just died and that was it. No restart, no nothing. Might be a good place to start though.

I thought that was up next to the driver's side fender though, not on the distributer like others have said....

I've had a couple times over the years where it would randomly die and be done, 2x it was the ignition module. Another was the fuel pump.

If you do replace the alternator, you'll probably have to buy the harness lead that plugs into it as well as there was a service buletin out on that (old one would short out and cause a fire) and any good auto parts place, and possibly even the poor ones, will have it in the book that both the harness and the alternator are swapped out as a pair.

Donovan from Wisconsin
 
Sounds like you have a bad regulator in the alternator.Voltage will run very high and blow the caps off the battery and bulge the battery case.The battery will stink when its getting over charged.Better fix this first.The ignition module may shut down when hit with over voltage.
 
A friend suggested that I check it when it was running to see the voltage output. I did an it was 12 volts. For 100 I can put in a new alternator so that is what I am doing tonight.
 
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