Update to dc/dc converter install
The new Dc/dc converter that goes between the alternator/chassis battery and the lithium batteries needs a starter wire to operate. I am assuming the 18ga wire connects to the top of the battery isola...
Forum Discussion
The solenoid shown in your diagram is the isolation solenoid between the starter battery and the coach battery, correct?
The wire “LR” you’ve circled is the activation wire for the solenoid, and should be switched by the ignition. You can confirm that with a 12v test light or volt meter. With the engine off and ignition switch off, there should be no voltage between that terminal and ground. With the engine running, there should be voltage. If that’s true, that’s your switched circuit to connect the D+ wire to. The purpose of the D+ wire is to activate the Renogy charger only when the engine is running. It doesn’t carry any charging current, which is why it’s so small. It’s just to sense when the engine is running.
The wire you said is labeled LG, is actually “LC”. It’s used for current limiting only. If it’s connected to a 12v source, the output of your 40 amp charger will be limited to 20 amps. I have no idea why you’d want to do that. If you want to use the Renogy’s full charging capacity, don’t connect anything to the LC terminal.
The DC input to the Renogy could be connected to the “CABLE ASM STATER-EXT RED 2” side of the solenoid (yes, I think that’s a typo as well). That cable should be coming from the plus side of the starter battery. Ensure you’re using the recommended gauge wire for the input and output wires connected to the Renogy charger. Both plus and minus.
:):)
The wire “LR” you’ve circled is the activation wire for the solenoid, and should be switched by the ignition. You can confirm that with a 12v test light or volt meter. With the engine off and ignition switch off, there should be no voltage between that terminal and ground. With the engine running, there should be voltage. If that’s true, that’s your switched circuit to connect the D+ wire to. The purpose of the D+ wire is to activate the Renogy charger only when the engine is running. It doesn’t carry any charging current, which is why it’s so small. It’s just to sense when the engine is running.
The wire you said is labeled LG, is actually “LC”. It’s used for current limiting only. If it’s connected to a 12v source, the output of your 40 amp charger will be limited to 20 amps. I have no idea why you’d want to do that. If you want to use the Renogy’s full charging capacity, don’t connect anything to the LC terminal.
The DC input to the Renogy could be connected to the “CABLE ASM STATER-EXT RED 2” side of the solenoid (yes, I think that’s a typo as well). That cable should be coming from the plus side of the starter battery. Ensure you’re using the recommended gauge wire for the input and output wires connected to the Renogy charger. Both plus and minus.
:):)
