In article ,
Gib Bogle wrote:
There are a couple of things going on here that I don't understand.
After sitting overnight the battery still reads 18v, engine not started.
This shows on three different scales of the DVM. Not believing it, I
checked with my old analog meter - same thing. How can a 12v battery
hold 18v of charge?

Never seen any battery that reads that much over its nominal voltage. Try
disconnecting it and see what it reads. And switch on the headlights etc
without the engine running and see what the reading is.

--
*All men are idiots, and I married their King.

Dave Plowman London SW
To e-mail, change noise into sound.