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Old 01-11-2013, 02:57 PM   #21
dmax
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Small update.. we noticed that when the DSC/ABS lights flicker, voltage reading jumps to 18v !! Warning lights stop flickering when voltage returns to 14v

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So, you going to do alt or just the VR?
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Old 01-11-2013, 04:05 PM   #22
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Small update.. we noticed that when the DSC/ABS lights flicker, voltage reading jumps to 18v !! Warning lights stop flickering when voltage returns to 14v

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Replace VR. Evaluate. Replace alt if necessary.
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Old 01-11-2013, 04:30 PM   #23
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55,000 miles on the car...you know, it shouldn't be alt, but seems like it.

You've checked all the connections...or will first? I swear, my alt just failed...it was original. Not that that means yours is fine...and it sure sounds like it's wonky, I wonder if a bad ground might lead to high voltage at times...electric isn't my strong suit!
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Old 01-11-2013, 07:58 PM   #24
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I bet if you checked A/C voltage with a meter, there would be a bit present as well.

Replace the VR. The actual guts of the alt should be fine at that mileage. No ground or poor connection will cause an overvoltage scenario.
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Old 01-11-2013, 08:07 PM   #25
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I bet if you checked A/C voltage with a meter, there would be a bit present as well.

Replace the VR. The actual guts of the alt should be fine at that mileage. No ground or poor connection will cause an overvoltage scenario.
I'd never heard of an overvoltage...sounds like a Voltage regulation issue, but usually alternators fail by producing low voltage.

What's going on that it could break by producing more?

I know Para, so I'm sure the belt was routed correctly! Could some other failure trigger a call for excess voltage...like bad FSR? I'm guessing...again, because I don't recall having heard of an alt putting out high voltage before.
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Old 01-12-2013, 04:53 AM   #26
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I'd never heard of an overvoltage...sounds like a Voltage regulation issue, but usually alternators fail by producing low voltage.

What's going on that it could break by producing more?

I know Para, so I'm sure the belt was routed correctly! Could some other failure trigger a call for excess voltage...like bad FSR? I'm guessing...again, because I don't recall having heard of an alt putting out high voltage before.
Nope, only way to do over voltage is with the alternator. It's takes a pretty specialized circuit to bump voltage back up.

Also, it is a somewhat common occurrence. Most often people notice it when the alternator overcharges the battery and you get a rotten egg smell.
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Old 01-12-2013, 08:52 AM   #27
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I'm pretty sure the alternator is capable of putting out 18-20 volts. It's up to the regulator to keep it between 13 and 14.7.
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Old 03-15-2013, 01:38 PM   #28
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***update***

Today I replaced the alternator, it was a Valeo 110Ah with a low-mileage used one, same brand/output. Unfortunately I couldn't source a Bosch one and the owner was on very tight budget. Anyway, battery light problem solved so as the weird cluster behavior mentioned a few posts above. Car's back to normal

Thanks for all the help!
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