my headlights dim some when my a/c is on notice just the other night when i give it some gas they brighten up ,lrt off the gas they dim again the battery is good .idle is set right any idea what may be causing this thanks in advance
All little dimming of headlights is normal when idling, especially when there are other electric componenets working, e.g. ac clutch, fan, lights and etc. If they dim a lot then you have a problem somewhere in charging system or headlight system. HTH, davidj92
If its when revs are above 1300 ish get your chargeing system checked. If its only on idle thats normal.
battery voltage should be around 13.8 when everythings turned on and over
1300 revs. Much less than that you have chargeing issues. Dont take your idle voltage as gospel. Should be static of around 12.5-13, engine idleing with no load around 13.3-13.8 and with higher revs and not loaded around the 13.8-14.3. Hope that helps you out.Go to Radio shack and buy yourself a $10 voltmeter and have a play.
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