2003 Toyota Tundra Battery Drain

I would start with a new battery and also measure the current drain on the battery.

2003 toyota tundra battery drain. How to find battery drain. All electrical items seems to function okay. How to fix battery drain in your car DIY with Scotty Kilmer.

If it is draining while your Tundra is off its usually caused by something that is drawing current that shouldnt be. It doesnt take much to kill a battery in 3-5 days. The battery would go completely dead within 2 days if not driven or eft on a battery tender.

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. Took the truck to a local stereo shop and they determined that the alarmremote start was causing a huge drain on the battery. I had a Compustar alarm with remote start in my 2002 Tundra.

That is a tough problem to solve as there are many items connected to the main 12V rail and any one of them can be causing the slow drain. Dealer replaced the battery in 205 and problems still here. I have a 2003 Tundra and since 1104 I have had problems with the battery going dead over night.

The only thing you can to is run an ammeter in series with the positive terminal of the battery with the engine and all accessories off. Doesnt happen evey night and sometimes goes for 3 or 4 weeks before going dead. How to do a parasitic draw t.

My 01 Exploder had the OEM battery for 6 years and at the end of that time it got just like you state. Car complaints car problems. I cant see any reason for the draindischarge.