On Mon, 26 Dec 2016 19:41:19 -0600, Califbill
wrote:

wrote:
On Mon, 26 Dec 2016 14:02:54 -0600, Califbill
wrote:

Problem I had with dead batteries, was the battery combiner. Wired in a
switch on it's ground line. Drew 15milliamps when in non combining load.
So even a constant draw in the battery with the selector switch off.

Sounds like a horrible design


Standard design. Some draw a little less, some more.. Has a voltage
sensing relay to connect the two battery's together when charge voltage
reached. Our have to put a battery on off switch in each battery line or a
switch on the relay circuit ground line.

These days I would expect a FET on that front end that was drawing
micro amps in standby.
I suppose a relay hooked to the ignition switch is an idea tho.