Good morning Gene, I owned, bought and sold trailers for years when I was an implement dealer and fought these wiring and charging issues a longggggggggg time lol FWIW here are my recommendations:
1) I would suggest using the standard wiring for those round 7 pin plugs and receptacles where the center is for BACKUP LIGHTS NOT 12 VDC auxiliary power !!!!!!! I would use the 12 volt auxiliary terminal instead
2) Regarding a charge wire circuit so when driving the trucks alternator provides charge to the trailer battery I WOULD USE NO LESS THEN 10 GAUGE WIRE to reduce line voltage drop, even if sure 12 Gauge will work and a lot use it. I just believe in over engineering and line voltage drop reduction which larger wire creates......
3) Overcurrent Protection is required for BOTH truck and trailer batteries, and with 10 Gauge wire I use a 30 Amp auto reset circuit breaker at EACH battery/source. This over current protection for the TRUCK BATTERY may well or may not already be in place using the factory set up ?????????
4) In order to allow the trucks battery and alternator to charge the trailer battery but NOT allow the trailer to discharge the truck battery, you could
A) Use an inline diode so current can flow FROM truck to trailer but NOT from trailer to truck HOWEVER there would be around a 0.6 Voltage Drop across the diode B) Use a relay so the charge wire circuit is ONLY activated when the truck is running but DISCONNECTS/OPENS otherwise. C) A or B can be achieved by a factory circuit configuration that provides power ONLY via switch and truck is running but NOT otherwise, if so you can get by without A or B !!!!!!!!1 D) Unplug
NOTES using the 7 pin connector and light gauge wire from truck to trailer via the 7 pin connector IS NOT FOR HIGH CURRENT. Those connectors are ONLY rated for lower current applications and long runs of light gauge wire cause a line voltage drop HOWEVER sure this set up can provide some degree of charging from truck to trailer and is used widely for intermediate to at least trickle charging the trailer battery when driving the truck GO FOR IT but I still recommend 10 Gauge Wire,,,,,,,,, 30 amp auto reset circuit breakers for BOTH batteries,,,,,,,,,,A method to prevent reverse discharge of the truck battery ..
TRAILER BATTERY I would use a DEEP CYCLE battery on the trailer.
Check out the overcurrent protection and reverse current discharge protection that may well ALREADY be a part of the trucks wiring !!!!!! If so it makes things easier and you dont need to worry about much of what I posted. Test voltage at the 7 pin receptacle on the truck to see if the 12 volt auxiliary pin (NOT center backup light pin) goes hot when truck is on but NOT when off and if so you don't need much else other then wiring and over current protection from trailer battery to the trailer plugs 12 volt aux terminal
DEDICATED HARD WIRED GROUNDS CAN PREVENT A TON OF TRAILER ELECTRICAL PROBLEMS
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