Engine Running Sense Wire???

[jff45]

It's a Renogy DC-DC charger. The doco says it won't turn on until is gets a signal on its' sense wire, they just skimped on the circuitry other brands use I guess.

I've been over the schematics and have found that I can get the signal from the wiper fuse as they have power when the ign key is in the 'On' spot. It's a hassle having to do this, but I guess that's why the charger was cheaper than alot of others.

If it really needs a signal on that sense wire, you can simply connect it to the cable on the charger that comes from your main battery. That will be the same as sensing 12v from ignition.