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1990 F-350 diesel lights brighten and dim


dbrhcts
11-19-2007, 08:31 PM
lights fluctuate at any thing over 1000 rpms, regulator or alternator ?

The Rider
11-19-2007, 10:27 PM
lights fluctuate at any thing over 1000 rpms, regulator or alternator ?Is your amp meter inside the cab fluctuating. If so, could just be a bad headlight switch. Try that its inexpensive and easy to get to. Had the same problem and it fixed it

dbrhcts
11-21-2007, 04:38 PM
Is your amp meter inside the cab fluctuating. If so, could just be a bad headlight switch. Try that its inexpensive and easy to get to. Had the same problem and it fixed it Amp gauge is fluctuating in rhythem with the lights, had seen this problem on another truck thought it was a common thing just didnt know what the fix was, thanks for the heads up

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