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Jeffh110
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JUL 15, 02:07 PM
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All at once the electrical gremlins have hit my 87 GT. I checked grounds and added another, but maybe there is more to do there.
- My headlights go about half way up then start to fliker maybe an inch or two but never go all the way up. They will close if I hit the switch again.
- With the AC on if the fan kicks on at idle it becomes erratic(1000 - 400 rpm) and dies. With the AC off it restarts right away and is back to normal.
- The voltage gauge reads 16 most of the time, under load with AC or the fan it drops to 11 or 12 then back up to about 13.
- If I have the ignition to on without the car running it will give me about 15 minutes until the battery is dead.
Battery is about 4 months old.
Should I try the alternator next, if I do it will be an 88 upgrade?
Thanks
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Vintage-Nut
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JUL 15, 03:46 PM
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With the engine idling, measure the voltage at the battery with a meter.
Do it again with the lights and A/C ‘On’.
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shemdogg
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JUL 15, 05:26 PM
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You have 16 volts on the dash gauge or on a voltmeter? Thats really high, shouldnt go over 14.5ish volts. Take the battery to a local auto parts store for load testing, should last more than 15mins. If you do indeed have 16 volts while running, the voltage regulator in the alternator isnt regulating.
shem
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theogre
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JUL 15, 10:32 PM
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Do Not trust dash gauges when you have a problem.
16 + volts should make ECM having CEL On and set related Code.
Check w/ meter
Battery Volts
Output of Alt on output term and case.
If those are high then have big problems that can kill other E-parts.
Check side plug on alt... Iffy connector or wire to A pin can high volts because Regulator gets "bad data."
Why?
https://web.archive.org/web...cast.net/~fierocave/ alt sense------------------
Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)
The Ogre's Fiero Cave
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Jeffh110
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JUL 16, 07:15 AM
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Thanks for all the replies. I will report back once I have a chance to dig in more.
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