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Battery voltage gauge drops when I turn on Fog lights

 
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BullDozer



Joined: 17 Jan 2016
Posts: 147
Location: Detroit, Michigan

PostPosted: Sun Feb 10, 2019 12:58 pm    Post subject: Battery voltage gauge drops when I turn on Fog lights Reply with quote

So I’ ve noticed for past few months if I manually turn on the fog lights dips a little then comes back up to original position. What’s strange is if I put on high beams no dip. AC same thing. I only notice it when turning on fog lights. Weak alternator? Maybe electrical issue with fog lights? Fog lights work and original bulbs. I can check RPM next time but it feels like a serious draw.

No worries or need to check it out?
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smj999smj
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Joined: 22 Jan 2012
Posts: 5373
Location: Prospect, VA

PostPosted: Sun Feb 10, 2019 2:24 pm    Post subject: Reply with quote

If the charging system voltage is from 13.2-15.0 volts with the engine running and the fog lamps "on," I wouldn't worry about it.
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twinblown



Joined: 13 Jul 2009
Posts: 162
Location: Central Florida

PostPosted: Wed Feb 13, 2019 2:57 pm    Post subject: Reply with quote

Not sure how many amps. fog lights draw but could be normal, these alternators have a feature called "load response control" which help alleviate torque on the engine when certain electrical loads are seen by the alternator therefore applying a smooth volt- amp transition no matter how heavy the load is to the charging system. Like mentioned if your voltage is within specs and your not having crank issues or a dead battery don't worry
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BullDozer



Joined: 17 Jan 2016
Posts: 147
Location: Detroit, Michigan

PostPosted: Mon Feb 25, 2019 9:09 pm    Post subject: Reply with quote

Okay thanks. Good to know as I definitely could use the exta lighting
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265/75 R16 Cooper AT3
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