When i bought my enclosed race trailer this year it had a Onan Generator 4000 Genseet Emerald Plus in it which the previous owner hooked up.

When i went to use the winch it drained the battery. I found out quickly that when the generator is running it is NOT charging the battery.

There is a plug with a bunch of cut off wires running off the generator.

Anyone know how i can get it to charge the battery?