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1992 F150 electrical/charging?
10-12-2008, 05:29 PM
Post: #1
1992 F150 electrical/charging?
I have an issue with my truck. It is an 1992 F150, with the 5.0 engine 5 speed trans.

I have replaced both battery and alternator, but still have a slight problem. Everything seems to work fine until I use the AC or defrost. Then, when I slow down and come to a stop the engine will die. I can also see that while running the AC or defrost, the battery voltage gauge starts to decline slightly. This problem only seems to happen while using AC or defrost; not headlights, radio, blower with vent or any other electrical accessories. Any suggestions on what may be causing this or what to look for? (Fuses, ground, diodes etc.. ) I have little knowledge regarding automotive electrical issues.

Oh, buy the way I did have to jump start the the truck several times during the course of replacing the battery and alternator. Is there any damage which I could have caused during this process that I might need to be aware of.

Mommy's Little Grease Monkey Strikes Again
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10-13-2008, 05:22 PM
Post: #2
RE: 1992 F150 electrical/charging?
I would check all fuses. Check to see if you have 12v on the large post on the alt. Check and clean all engine to body grounds. Do you have good clean and secure battery connections?

Cary Joe York
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10-13-2008, 07:51 PM
Post: #3
RE: 1992 F150 electrical/charging?
CaryJoeYork Wrote:I would check all fuses. Check to see if you have 12v on the large post on the alt. Check and clean all engine to body grounds. Do you have good clean and secure battery connections?

I haven't checked all ground connections yet, but battery connections are clean and there may be a crack in the positive cable end, it looks as if someone prior to my ownership may have tightened the end to the post way past the need. Unfortunately it is raining today so I will get back with you later to give feedback on what I found.

Thanks

Mommy's Little Grease Monkey Strikes Again
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10-14-2008, 10:37 AM
Post: #4
RE: 1992 F150 electrical/charging?
Another think to look at is the idle speed. Perhaps the idle compensator is not keeping the RPM up with the added load of the compressor and the slow idle is to blame for both low alternator output and stalling.
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10-14-2008, 08:48 PM
Post: #5
RE: 1992 F150 electrical/charging?
Hello all,

Here is the latest info, all connections are clean and well grounded, no bad fuses, found a vaccuum line that goes to the charcole canister from what I think is the throttle body? that was deteriorated and replaced. It seemed to help with surging of engine when AC/defrost is running but I will have to drive it for awhile to determine if problem goes away. It may only happen when engine is good and hot,???

Mommy's Little Grease Monkey Strikes Again
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10-14-2008, 11:53 PM
Post: #6
RE: 1992 F150 electrical/charging?
Sounds good that you found something at least related because any vacuum leak will throw engine parameters out the window.

It may take a few driving cycles for the ECM to "learn" new conditions so give it a day or so to see what happens.
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