2003 Toyota Tundra Battery Drain

Discussion in 1st Gen Tundras 2000-2006 started by SouthPaw May 31 2021.

2003 toyota tundra battery drain. Seems the frist half of the production year 2003 Tundra has a problem with the tow package relay being left energized if you leave the lights in the daytime running position so that they turn off by opening the door it will run the battery down. If it is draining while your Tundra is off its usually caused by something that is drawing current that shouldnt be. Im not sure how long its been doing this because previously I was driving the.

Something is discharging the battery overnight. How to do a parasitic draw t. If the battery is draining while youre driving that is probably going to be the alternator or battery.

Any suggestions on how to troubleshoot. I started to pull relays one at a time and when I pull the efi relay it stops. I have a 2003 Toyota Tundra V8 4WD.

If it seems high start pulling fuses to see what circuit is causing it. Car complaints car problems. How to find battery drain.

I had a Compustar alarm with remote start in my 2002 Tundra. How to test battery. The battery is not holding a charge after a week or so of sitting idle.

Funny enough it started the first time during the day not the later times. I cant see any reason for the draindischarge. You need to hook up an Amp clamp to the battery cable and see how much drain there is when its just sitting.