Power Draw battery run down
04-21-2018, 03:02 PM
#1
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Power Draw battery run down For the past year i have a power draw of around 1.8 amps measured at the main wire going into the under hood fuse block. Battery will run down in a couple days.
I have removed all of the fuses and relays on both underhood and the side dash blocks with no change in the draw.
Any ideas on where next to look?
I have removed all of the fuses and relays on both underhood and the side dash blocks with no change in the draw.
Any ideas on where next to look?
04-22-2018, 08:15 AM
#4
TECH Fanatic
+1 on removing the alternator connection. As suggested, a diode has perhaps failed towards ground. I'll bet you lunch that a good Fluke voltmeter at the battery set to measure AC volts would show some AC leakage reaching the battery with your car running. Rev up the RPM a little and watch the multimeter. This should be less than around .05 AC volts at the battery with the motor running. AC volts hitting a DC-loving 12 volt battery is never good for the battery.
Be advised that a cheap multimeter will struggle to measure small amounts of AC. Think cheap Harbor Freight, Home Depot or Lowes - they probably won't be good enough here. You will need to spend 30-ish or more dollars on a multimeter but nothing like what I spent on my Fluke 17B model.
Rick
Be advised that a cheap multimeter will struggle to measure small amounts of AC. Think cheap Harbor Freight, Home Depot or Lowes - they probably won't be good enough here. You will need to spend 30-ish or more dollars on a multimeter but nothing like what I spent on my Fluke 17B model.
Rick
04-23-2018, 12:41 PM
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This is interesting...
...how was the stock amp still getting power with every fuse and relay pulled?
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04-25-2018, 12:15 PM
#9
That would be fuse #4 (not #24)... 25A fuse labeled RADIO ACCY. It provides battery (constant) power to the Monsoon amp, power antenna and remote CD changer in vehicles that have them. The amp uses signal sensing to turn on and off unlike most aftermarket amps which have a separate control signal. So your amp is "seeing" an audio signal somehow that's keeping it turned on or it's defective.