At 12:07 20/09/02 -0500, you wrote: >Boy, am I steamed. I put all that effort into getting good pack isolation, >and the next thing I know, the car has aground fault, seemingly right in the >middle of the pack. The really weird thing is that I have an odd number of >batteries, and the fault really is *exactly* in the middle of the pack. >Voltage from ground to the positive terminal of the most positive battery in >the rear pack is +2.8V. Voltage to the negative terminal is -3.6V (this was >while charging). How is that possible?
The only way is that you have two paths (relative to the batteries) to ground. I'd be looking at the hardware at the ends, not around the batteries. You could disconnect the batteries both ends and use a "megger" high potential resistance meter to see if your batteries have leakage (just from anywhere on the pack to frame). Hope this helps. James.
