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If you want to be SURE that is installed then I would think the only way at this point is to backtrace the wire harness starting at the plug and work your way towards the cab. I bought mine used from a private party and had to change the 6 pin to a 7 pin. I didn't bother to look for a circuit breaker/relay as I only had power to plug with key on, meaning if I left the trailer plugged in to the truck while parked it wouldn't drain the truck batteries..that was good enough for me.
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1994 F-350 7.3 IDI Turbo, crew cab, E4OD, LB, Dually, 
ATS Turbo upgrades: 3" DP with 3" exhaust Magnaflow XL muffler: Pictures Here
1997 Jayco fifth wheel 323 RKS, Robins 16K dual axis hitch
Apillar pod with: Autometer C2 Series gauges: pyro,trans, boost 
Hypermax Cowl induction, Flex-A-Lite 26K tranny cooler w/fan
K&N air filter (we'll see in a million miles) 
Tekonsha "prodigy" brake control
Train Horns: Pictures here
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