Battery Switch and Brake breakaway protection
I've finally decided to install a battery cut-out switch in my Copper Canyon. It seems simple enough - put the switch between the battery and the junction block where the Positive lead is attached to...
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The ohmmeter is your friend. Lift all 4 wires from the battery+ terminal of the distribution block. Be sure the RV is unplugged from shore power so that you don't have the converter trying to charge the battery (probably one of the wires going to that terminal). Now, measure each wire's resistance to chassis ground and, while doing so, pull the breakaway switch. When you find the wire whose resistance drops from infinity to a very low level, you've found the wire going to the breakaway switch. Wire it upstream of your battery disconnect switch so that it always has power.
If all 4 wires are tied to the positive terminal of the distribution block, I'd bet they are the following:
1. 12VDC power from the umbilical cord to allow the truck's alternator to charge the battery while traveling.
2. 12VDC power from the converter to charge the battery while plugged into shore power.
3. 12VDC to the 12VDC power distribution (fuse) panel in the RV and then on to the 12VDC loads.
4. 12VDC power to the breakaway switch.
Rusty
If all 4 wires are tied to the positive terminal of the distribution block, I'd bet they are the following:
1. 12VDC power from the umbilical cord to allow the truck's alternator to charge the battery while traveling.
2. 12VDC power from the converter to charge the battery while plugged into shore power.
3. 12VDC to the 12VDC power distribution (fuse) panel in the RV and then on to the 12VDC loads.
4. 12VDC power to the breakaway switch.
Rusty
