The existing five wires should be good. You need to figure out what five wires you have, since there are a couple configurations. You certainly have these four.
o Left turn
o Right turn
o Ground
o Running lights / tail lights
The fifth wire may be backup lights, or electric brakes (but probably not if you don't have a controller). Both of these are part of the 7-wire hookup, so you will need to add whichever one you don't have.
Your current setup almost certainly does not have a battery charge line, so you will need to add that. When you do, make sure the wire goes all the way to the alternator or tow vehicle battery, is 10 gauge or larger, with an isolator (I prefer a relay isolator, not a diode isolator), and a fuse/circuit breaker.
Bill
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