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Old 04-16-2019, 10:21 AM
jpeteyjr jpeteyjr is offline
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Arrow Where's the voltage regulator ?

Soooo...back to the fluctuating headlights & dash lights.
'05 RT; headlights & dash lights fluctuate at idle, steady while driving.
I'm thinking that this may be caused by a wonky voltage regulator. Is the regulator a separate unit or is it incorporated into one of the "CM"'s?
Any info is greatly appreciated !
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Old 04-17-2019, 09:08 AM
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Not positive but I think it's controlled by the PCM.
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Old 04-18-2019, 08:53 PM
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The alternator has a built in regulator, It sounds to me like the alternator is about to go or maybe a slipping belt.
I believe the PCM controls just the relays for the lights, not the power going to them.
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Old 04-19-2019, 11:31 AM
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PCM controls voltage. Usually when this happens there have been two fixes, upgrading the major ground straps (neg batt to chassis and engine to chassis) or PCM replacement.
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Old 04-24-2019, 05:14 AM
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Thanks for all the info.
I'll check the ground straps first. Hope that will fix this problem.
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