Setnev Posted June 6, 2017 Share Posted June 6, 2017 I seem to fighting a weird electrical anomaly with my car recently. I say recently because I only noticed voltage drops since I upgraded my radar detector to one that has a built in voltmeter. It's pretty accurate, I used it in my old car that suffered terribly from voltage inconsistencies (and it was a newer car). I noticed it before with the car, but only when the headlights and heater were on in the winter. At idle the lights were dimmer than normal and then when I'd take off, the lights would brighten and heater seemed to speed up. When I'm driving around town now, I can monitor the voltage more closely. When I'm at a stop light for more than 30-40 seconds, the voltage drops to 11.7 or lower. When it sits like that for more than 15 seconds, the alarm on my radar detector goes off and tells me car voltage low and auto shuts off until I accelerate from the stop light and it turns on and the voltage is around 13.5+. It does not matter what I have turned on in the car. The alternator is fairly new, reman date 5/2016, I just replaced all of the battery cables with brand new 4 gauge wire. I have a 4 ga wire running from the positive to the starter lead and positive to alternator lead. I also changed out the ground wire on the block to a 4 ga wire leading directly to the negative cable. I did not replace the negative to body wire yet. The battery is brand new (about a year old) and I just replaced the battery terminals with gold plated connectors. Mind you, these symptoms were present before I worked on any of this and I did not replace the battery or alternator, these were done before I got the car, but I read the dates on each of them. The battery was strong, even in the winter, cold starting the car in 30 degree weather on first try with no weakness in cranking. Any ideas where to look next? Link to comment Share on other sites More sharing options...
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