Just completed changing out the exhaust system (all pipes, converter, muffler and o2 sensor) on my 84 camper and i found an "extra" wire hanging.  I do not think i disconnected this wire but not sure and i can not seem to find where it might go.  The wire is a green with black stripe but someone has extended it with about two feet of red.  This is in the same bundle with the wires to the sensors in the coolant tank.  I tested this green/black and it is an ignition switched 12 v.  This camper is new to me and i am finding my way through it.  any ideas where this could go to?  I do have the Bently manual but could not seem to find it in there.

Thanks,

Darrel