OK, I've examined this wiring schematic, and I don't really follow what is going on. I know a little bit about wiring schematics, but I'm not able to follow here.
It looks to me like power comes to the Charging Relay from the Chassis Relay. The Chassis Relay comes with the Ford Chassis. I assume this is the starter relay? Or is this a different relay?
Anyway it seems to send power over to the Charging Relay.
The 3-way switch in the cab. If I hold it to the right, it is in boost mode. If it is in the middle, I think it is "off", and if you click it to the left, it should charge the house battery if the engine is running. (But I do not think it will discharge the house battery if the engine is off). I believe this switch is shown in View C-C.
The schematic references something called "battery changeover". I don't know what that means.
It looks to me like the Chassis Relay sends power to the left side of the Charging Relay (see View A-A).
The right side of the Charging Relay sends power to the 4 Circuit Breakers. So, when the Charging Relay is energized, it is then powering the 4 circuit breakers.
If I'm reading it right, wire LR is the center position of the 3-way rocker.
I'm not sure how to read the wire designations. LR, KE, LS, etc.
In view C-C, LR is shown as 16 gauge purple. But in view A-A. LR is shown as 14 gauge purple. I assumed these were the same wire (LR ?) but since they are different gauges I guess not.
So looking at this I still do not understand what is physically happening to the circuit in Boost mode, Charge mode, and the middle.
And I don't see how this is related to chassis battery charging, if at all. Maybe the Chassis solenoid is actually bad? Is this the same as the Starter Relay?
Sorry for being so confused here.
Steve
