I have a 2012 Ram 3500 6.7. My truck batteries go dead in a few days when left sitting. I did a parasitic draw test with a multimeter on the drivers negative post and the passengers negative unhooked. The meter is reading 0.300 amp. I pulled fuses and no change till I got to a big silver one labelled as CB1 memory seats, the amp then drops to 0.020. What does this all power. What could be causing this drain on the batteries.

 

That's a circuit breaker. Owners manual might tell you what its for.

How old are your batteries?

 

Batteries are brand new last week. Last set went dead and froze.

 

Do you have something stuck under your seat that may be preventing it from moving to the memory location and causing a constant draw as the seat tries to reposition? Although a stalled power seat motor would likely draw much more than 300 mA.

-Rod

 

No nothing under the seats. Spent the day unhooking seat motors and stuff under there to see if any thing would change.

 

Have you tried leaving CB1 out, let the vehicle sit for days, then see if the batteries are dead? With 2 batteries a 300mA draw should not cause a no-start after just a couple of days, unless maybe your oil is REALLY thick.

-Rod

 

Its -25 celcius here so he batteries don't perform at there best..havent had it happen when its warmer. I left the CB1 breaker out and haven't had a problem.

 

When it warms up a bit you can use a test light in place of the circuit breaker, then unplug items on the circuit one at a time until the test light stops glowing brightly. When you find an item that causes the light to glow brightly by itself, that's the item that's drawing the current.

-Rod