Hot Wire
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5th Wheeling
Joined: Jan 2003
Posts: 47
Likes: 0
From: Oregon Coast
Hot Wire
I need to hook up the 12 volt wire to the 7 way trailer plug on my 1989 F350 so it will charge the RV battery when I am towing. Should I hook the wire to the hot side of the solenoid which would make it Hot with the key off or should it be hooked in with a relay? If so how is the relay hooked up and to what? Also what size of fuse should I use?
Thanks
Matt
Thanks
Matt
. 
Post Fiend
Joined: Jun 2001
Posts: 5,228
Likes: 5
From: Running Springs CA
The factory tow package uses a relay, 30 amp fuse and #12 wire. The reason you can use #12 instead of #10, like in residential wiring, is because the wire is not enclosed in conduit, which holds in the heat. If you do not use a relay or battery isolator you can run down your starting battery.
Jim
Jim
FTE Chapter Leader
Joined: Feb 2004
Posts: 14,904
Likes: 76
From: Wayland, MI
If you start your wiring from the switched side of the solenoid you would already be doing the same thing as putting a switch in-line. The breaker is very important so you don't get any back feed surges to your vehicle.
Toyman
Toyman
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