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Wire Cable Size From Jackalopee to RV Plug


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There seems to be several options available for the cable for the RV Plug. There is 14/6 or 2/10, 1/12/4/14 and a couple of other option that I have found on the internet. Of course you can purchase the same wire that is on the tractor now as well. What do you all use or recommend?

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In trying to get as much 12 v current to the trailer as possible (for battery charging and the like), I'm using the standard HDT style plugs, and the wire is HDT ABS trailer cable. This is

1#8 - Ground

2#10 - +12 and brake

4#12 - STT (stop, turn, tail)


Remember that the ground takes ALL the current back to the truck. Before LED's:


brake - 6 brake pucks @ 3 amps = 18 amps

brake lights - 4 @ 2.1 = 8.4 amps


running lights - DOT min -

5 top clear, front and back, = 10

4 in the tail lights, = 4

6 per side marker lights, 3*2=6 *2 = 12

call this 0.5 each = 26 * 0.5 = 13 amps


and since we have all these lights on assume nothing for the battery


so when you stop - 39.4 amps on the ground return line



when not stopping - just 13 amps + say 5 amps for the battery = so only 18 amps then.


just some broad strokes and LED will drop the lighting portion a lot / or running in daytime with the lights off, but you get the jist of the argument


on edit, that would be why I run an inverter in the truck and charge the trailer at 125 VAC. That and the battery charger is so much better than hanging batteries out at 75 foot from the alternator - 35 foot out and back

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Here's what you need to make truck, Jackalopee andRV "happy" http://www.waytekwire.com/products?pSearch=WT702

With that cable I assume the 12ga blue is sufficient for the brake controller. If that is the case then I will source some here locally. Thanks for the input. I found a great place to mount the Jackalopee and want to get started on the wiring. Any preference for the truck side RV Plug Connector?

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This cable seems to be designed for the RV industry with blue being the heavier gauge wire for brakes. 12 gauge is sufficient, although 10 would have been better to reduce voltage drop.

Remember that in most applications the brake controller is not trying to lock the brakes up with the maximum current. The brake magnets are 3 ohms each therefore each can pull maximum current of 4 amps in a 12 Volt automotive system. Therefore, 2 axles are 16 amps max and 3 axles are 24 amps max. Rough rule of thumb is, you need 12 gauge for 20 amps and 10 gauge for 30 amps. I doubt there is an electric brake controller out there that is capable of producing (and controlling) more than 15-18 amps of current (if they claim otherwise they are lying), so 12 gauge is OK.

Truck side connector http://www.waytekwire.com/item/35675/TRAILER-CONNECTOR-7-WAY-PLUG/

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