Originally Posted by Dave T
The purpose of the battery isolater is to have both set of batteries charged while plugged into shore power or while the engine is running charging the batteries off the altenator. But also to make sure the engine starting isn't drained by power used in the coach when not plugged into shorepower. Engine starting is always # 1 choice. I'm guessing you do not have this feature. The engine starting battery can go dead if it doesn't have maintance charge on it.
A digital volt meter is the best way to check a battery's votage as this chart shows. 12 volts is just about a dead battery
Voltage State of Charge
I'm still don't why both sets of batteries?? 2 troubles ?
Can you jump start the engine or put a charger on it's battery?
Hi Dave, With your battery chart info I thought I would try charging both sets of batteries but before doing so I carried out a full check of all controls and hey-presto I noticed that the light switch was partially out, why or how I have no idea and unfortunately since the winter overcoat was on which covers the van from the rear roof down to the front bumper and covers all lights I do not know if the main beam or side lights were on (or not) however after charging for 4 days surprise surprise the engine started and all appears ok. Now I have to work out how the switch was on!!! many thanks for the battrey charge data without it I would still be wondering what was wrong so thanks again