PunksRV wrote:
I pulled out my two 12-volt chassis batteries about a week ago to take them to my home and charge them as I don't have ac power at my storage location (the coach is not on shore power). The four house batteries remain in the coach as they are charged by a 100 watt solar system. The main disconnect for the house batteries is off.
Today my tenant called (my RV is at my rental home) and he stated that he has witnessed the windshield wipers cycle on several occasions. I don't see how this could be possible with the chassis batteries physically removed from the coach.
The coach is a 2006 National Tradewinds 40D on a Freightliner XC chassis with a 400 Cummins Diesel. Any ideas on what the issue could be or where to start on troubleshooting this would be greatly appreciated.
Paul,
It seems I remember that the 12v isolation mechanism allows the engine alternator system to charge house batteries, but doesn't ever normally allow the house system to drain the engine batteries. Unless defective.
What may be the case here, in some situations the engine can be conveniently auto-started off the house batteries if the start battery is dead. By removing chassis start batteries (now acting dead, so to speak), this mechanism may now allow some house power to feed back to the ignition system. The wipers should not cycle anyway provided they are not set to periodic-wipe, but may operate randomly anytime if the wiper rest position shut-off contacts are corroded. This rest position switch normally makes the wipers run just until they land in proper down/off position after normal shut-off.
Wes
...
