Post by
Mikey178 »
https://forums.nicoclub.com/mikey178-u136238.html
Sat Mar 10, 2012 4:14 pm
Hi,
I have a 2000 Infiniti QX4. Been dealing with this issue of battery drain recently. Started when I parked vehicle in the cold for 5 day. Went to start it after and the battery was dead, got it boosted and drove home fine. Used it for 3 days more and began to notice the interior lights dimmer than usual. Starting seem to struggle until it wouldn't start anymore, just clicking. Starter was replaced about a year ago and battery was 3 years old and never had the battery fail me. I replaced the battery thinking it was the issue and it was back to normal. 4 days later, issue re-occurs again, does not start, battery seemed to be drained. I could boost it to start.
Hooked up voltmeter to battery and it was reading 8.33V with no load and everything off, not good, couldn't start the vehicle, boosted the vehicle and it was charging but at idle would only be at 11.2V - 11.6V, rev the engine and it would go up to 12.8V max, so I figure the alternator is charging and working but the battery was pooched. Turn the vehicle off and the reading drops from 11.6V and continuously goes down by 0.01 every second or two until it gets to about 8.8V. Got it exchanged and that is where I'm at today.
I have done some research and found that I may be dealing with a battery drain issue. With the new battery installed I checked the readings. 12.4V with no load, hooked up the battery, started the vehicle and its charging and everything is back to normal. Turn the vehicle off, reading on the battery is slowly decreases by 0.01V evey minute but almost stablizes around 12.35V - 12.4V. Hooked up to do a fuse pull test, negative cable attached to the - terminal on the battery, with the positive cable disconnected from the + terminal. I put a 10A ampmeter between the new battery + terminal and the positive cable. Reading with no fuses pulled is 0.4A (This I think is too high), pulled fuses from the engine fuse box with no change. Pulled the following fuses from the fuse box behind the coin box with it causing the amp to drop to 0.04A: Hazard (20), ELEC B (27) & Audio Amp (4).
At this point, I have left these 3 fuses pulled and checking the reading on the battery, reading is stable at 12.37V, checked for the past 2 hours every 30 minutes. I think I have isolated where the drain is coming from at least to these 3 fuses. Hazard and Audio Amp (ACC) had the least impact on the drop of the amps that I was reading and the significant drop was from ELEC B.
I've gone through the electrical service manual to try and locate what fuse ELEC B was feeding but have not found anything on it. Can anyone help with this. Im going to continue checking the voltage reading on the battery today to ensure there is no futher drop (drain).
Sorry for the long post but just wanted to ensure who ever could help could see where the issue began and what I have done up to now.
Thanks in advance.