Between work and nature, I didn't get much done as planned this weekend.
What I did finish is the dual battery charge system for the trailer. Well, finished until I own a DC-DC charger on the trailer, then a little change up to what I did here will happen. Might be a year before that happens, so this setup will do in the meantime.
I needed a decent wire ran to the bumper from the battery, to trickle charge the Aux battery bank of two group 31 MAGM's in the trailer, while towing down the road. The trailer has other means of charging the batteries while parked, but I wanted to be able to charge while going from place to place too.
The 7 pin harness was installed a while back, and it has a 10 awg trickle charge wire in it, just like the trailer harness has. I wanted more than that charge wire could offer. I didn't hook those wires up. I opted for this instead.
I ran 600 volt 4 awg welding cable, from the front to the back along the frame rail. It was completely sleeved with flex tubing. From the battery, it runs to a 140 amp smart charger, to a 150 amp circuit breaker, to the rear and terminates with a 175 amp Anderson connector. A 4 awg ground wire was attached to the frame and to the Anderson connector as well. It is stored behind the bumper until needed, and fed through an opening in the bumper to be hooked up to the trailer.
So where to put these charging gizmos? They need to be close to the engine battery. I have a space where the ABS pump used to be, but that space is already spoken for another mod coming soon. I decided to cram them next to the power distro box, but needed a way to mount them.
Using a 10"x3"x1/8" pc of flat stock, and a pc of 1/8" hanger stock, I made the mounting bracket. The smart charger, and the circuit breaker was bolted to it with stainless hardware. I made a Z bracket and used it to bolt it to the interior fender wall on one side. Then a bolted to an existing tab on the PDB bracket. I had to remove the PDB for room to wire it up and bolt it down.
Once I had it mocked up, I could measure the cable lengths, and install the copper lugs on the bench with the hammer crimper. Off it came, put the cables on it, and back in it went. (bored yet?)
Trailer side will have the same cables on the other half of the 175 amp Anderson connector, then to another 150 amp circuit breaker, finishing off at the batteries. This is way more charge than that 7 pin harness 10 awg setup, and the DC-DC charger will be leaps and bounds over this setup. Reason for not using a 2 awg cable, is because of the future DC-DC charger install. It doesn't need anything larger, as it amplifies the current, just like a stereo amp does before sending it to the speakers.