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Battery voltage gauge drops when I turn on Fog lights
Posted: Sun Feb 10, 2019 1:58 pm
by BullDozer
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?
Posted: Sun Feb 10, 2019 3:24 pm
by smj999smj
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.
Posted: Wed Feb 13, 2019 3:57 pm
by twinblown
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
Posted: Mon Feb 25, 2019 10:09 pm
by BullDozer
Okay thanks. Good to know as I definitely could use the exta lighting