Battery Drainage?

[BIG JOE]

I have interstate megatrons.
alternator is fine because when i drive the batteries charge and will stay recharged as i drive constantly its only if the truck sits for like overnight do they drain

where is the AIH solenoid and disconnect? i Might try that....any way to tell if its stuck "on"?

and all connections are nice and clean!

The AIH is on the input (left) side of the Y pipe. The relay for it is just down and to the left, with a heavy gauge wire leading to the AIH, center lug.

With the Key Off.. Connect a Test Light or Volt meter to the center lug. The light/meter.. Should Not indicate any voltage at all.

Joe

 

[Deerjager]

Ignition switch could be a possible culprit.

 

[Stroked68]

The AIH will drain the batteries really fast, within half hr. Plus at night you will see the heater body glowing red up by the intake tubes.

 

[DOC-MX]

If previous test doesn't work try removing both positive terminals tie one out of way so not to touch anything ,take other terminal and put a voltmeter or test light between battery post & terminal if you get more than 3-4 volts or light is on you have a drain. Make sure everything is off while doing this. If you find voltage or light start pulling fuses 1 by1. When light goes out you have found the circuit that is causing your drain, Good Luck..
Also works to take the test light and substitute a fuse if you have a dead short that keeps blowing fuses

 

[Bdons SD]

Could be a shot in the dark. Do you have keyless entry? If so how's the battery on your key fob? If the key fob battery is almost dead it will send a weak signal and "confuse" the receiver and the relay will drain the battery over night. Found that out the hard way ha ha. I had my batteries tested many times and I was stumped. I finally got around to changed the battery in my key fob and then no more dead battery. I double checked this online and with my truck guy.


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