Engine Running Sense Wire???

[jff45]

It will charge full time/even if the engine is stopped if you do that. My ctek has the same wire, apparently the smart alternators don't always reach the "on voltage" required to activate the charger so you need to connect that wire to a 12v ignition source. You can try it without it, my (Gu) alternator looks close to standard(non smart) voltages. I've never seen mine drop below 12.7 when running and usually hits 14.1 when first started.

I did say “if it really needs that wire connected” to turn on. The VSR should handle it from there. I don’t believe it will continue to charge until the main battery runs flat.
My Projecta IDC25 continues to charge when I switch off until the main battery gets down to 12.7v

Just had a look at the Renogy wiring and it apparently needs that wire to switch it on. Strange if it has a VSR already..