3.5 Amp parasitic draw even when all fuses are pulled out of car and aftermarket stereo is disconnected - 2002 honda civic UPDATE: Looks like a bad diode on the alternator. Pain in the butt to diagnose, but after disconnecting the cables running to my alternator the draw went away.
Parasitic draw on the house batteries is not related, AFAIK, to anything in the cab unless the start assist is somehow closed or shorted out or a solenoid has failed in the closed position somehow. Since your problem is the house batteries, we need to look for draws on them which eliminates anything in the cab (unless you or a PO installed something up there which runs off the house batteries).
Most Cars in the recent 15 years will have a parasitic voltage draw after just 24 hrs. Easy 0.2-0.6 volts and hold just above 12 volts thereafter unless never used for months, the voltage will drop under 12v. It changes depending on the battery condition, car manufacturer year and manufacturer smart charging system in the car. A modern car's parasitic draw is should be in the range of 10-50 mA, if your seeing over 50mA it's time to start pulling fuses to identify the circuit then dig down to the item. Remember to allow the vehicle to sit for 2-5 minutes after shutting it off to allow everything to stabilize. Dec 24, 2006 · LT1 Parasitic Battery Drain. This is a discussion on LT1 Parasitic Battery Drain within the LT1 forums, part of the Vehicle Specific category; I have a 94 firebird formula with 83k miles on it. My car started to have a slow battery drain ... But, if you want a Jeep TJ Specific Acceptably Parasitic draw, It is Below 30mA. The BCM (Body Control Module) has about 20mA draw, the Central Processing System has about 20mA draw, the Electronic Level Control, if equipped, has about 20mA draw, Illuminated Entry has around 1mA draw, and the Radio does about a 15mA draw.
Automobile batteries commonly have a capacity of 48 amp hours. This means that it can deliver 1 amp per 48 hours, or 2 amps in 24 hours, 8 amps in 6 hours, and so on. So a 2 amp charger will deliver 2 amp per hour to this “flat” battery, and if it requires 48 amps that in means it needs 24 hours to fully charge.