Thanks for the responses! Been using a 10watt solar panel on the coach batteries and it works really well. 10w isn’t enough to keep up while camping, but is fine for maintaining charge while in storage. The panel sits on the dash and is plugged into one of the coach outlets.
I tried it on the chassis, through the dash and it didn’t seem to be working. I thought there might be a diode in the circuit. It is a very tight fit for the plug so maybe I wasn’t making contact, or I didn’t wait long enough to see an increase in voltage. 10w isn’t very much juice!
I’ll try again and report back.
Thanks!
Norm