".JIMinMA." wrote in message
...

"Calif Bill" wrote in message
link.net...
If starting, the voltage will be below 13.4V and the batteries will not
be
combined. I installed one on my boat as the electronics power cycled
when
starting the motor (351W inboard). They happily stay on now. The only
isolators I have seen have been the diode units. The combiner is a
relay.
Bill
Your right. I didn't think of that. Battery voltage typically goes to
about
10 V when the engine is cranking so the West Combiner/Isolator would be in
Isolation mode. How do you handle an emergency start situation when the
starting battery is dead?
Jim



I have a Guest dual battery switch. The combiner is hooked up to the 1 and
2 battery connections and then off the #2 connection is a wire to a single
battery switch. The electronics runs off the single switch. So to run the
boat I have to turn the dual switch to #1 and also turn on the single
switch. If #1 is dead, just turn the dual switch to #2. I lost a Pinpoint
sonar unit when starting one time. The EMF kickback from the starter /
solenoid blew a cap and the power supply in the unit.
Bill