Dash lights movin to the beat

[jnj]

Can anyone explain why my dash lights pulsate? Seems to happpen more on a cold vehicle, goes away after a while. I think I can see it in the headlights as well. My first thought was too much amperage being drawn by radio amps, but not to be. Still happens after radio is off.

 

[taegdh]

Check the voltage regulator output on your alternator. That is a sign that it is about to STB.

 

[Ken]

Are you sure that it's just not the photocell doing its job?

 

[WhalePirot]

I've seen the amperage required for heavy bass notes alter the lighting. Radio off; no pulsing?

Methinks the photocell is out of the circuit when the lights are on, right? Could eliminate a bad 'P-cell'.

I would have the alternator w/ regulator checked by a specialist, electrical shop.

 

[jpanek]

Mine dim in synch with the turn signal flashing, and my alternator has less than 10 milliVolt AC ripple and puts out plenty of amps (70 or so on a cold start with the lights on). Could it be a bad electrical connection and if so where?

 

[RedRagTop]

Mine does it too, I think it's a common concern, but in 3 years and 10K no problems have developed. Doesn't matter if I cover the photocell either...

 

[tlong]

Heavy volume bass beat flashes on the big lcd. I have new big time alternator. The stereo is 200 watts. It hasn't blown it up yet, just a little disco effect at no charge.

If it does it all the time I am clueless. The guy that fixed my brake lights for $450 could tell ya.