why are my lights dimming

Asked by suchster36 Feb 13, 2015 at 11:52 AM about the 2004 Ford F-150 XLT Ext. Cab 4WD

Question type: Maintenance & Repair

when im driving the lights an heater dim when I come to a stop or take my foot off the brake, replaced the alternator an battery an still does it

4 Answers
74,400

OJ answered 9 years ago

Dimming lights are an indication the proper voltage is not being applied to the circuit. Remove the fuse associated with the lights. Use a digital volt meter and check for 12 volts across the two terminals. You may have a loose or corroded ground. Check the ground from the battery to the block and make sure it is not corroded. Also check the alternator with the engine running. It should read slightly over 14 volts. Rebuilt alternators have been known to be bad out of the box.

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JUANBRUJO answered 3 months ago

I HAVE A 2001 F150 I REPLACED THE STARTER AND ALTERATOR AND BATTERY MY LIGHTS FLUX TO THE ENGINE BRIGHT AND DIM

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157,885

James answered 3 months ago

This thread is 9 years old. Please start a new thread so everyone can see your question. Jim

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