Quote Originally Posted by nkarrs View Post
Ahhh, thanks. This thing is driving me nuts.
Yeah, we've all been nuts at one time or another. Some of us are stuck there.

Do you have a multimeter? If not, go to Harbor Freight and get one of the cheap ones. Their cheap 7-function meter has a 10 Amp DC scale. Read the book or find a friend who knows how to set up the meter to measure DC Amps on the 10 Amp scale. Turn off all of the electrical stuff in the vehicle. Lift the positive terminal clamp off the battery. Connect up the meter to read DC Amps from the positive terminal of the battery to the clamp you removed. With all of the electrical stuff OFF, you should read no current being drawn from the battery - the meter should read 0.00X.

If it doesn't, you have a parasitic drain. Start disconnecting things. This is a tedious task - but there is no easy way. I'm not sure you don't have a starter issue if it still only cranks the engine a half turn or so with a good battery.

Troubleshooting by email is hard. but we'll hang in there with you.