Date registered: Aug 2002
Vehicle: 190E, 400E, SLK350
Location: Chesapeak Bay
Mentioned: 2 Post(s)
Quoted: 991 Post(s)
TK, here is a simple trick:
Have an extra wire and connect it to the chassis inside the cabin.
Take ONE of the black wires (that you are puzzled with) and connect it to the positive of the inverter
connect the wire I told you to attach to the chassis to the negative of the inverter
If the inverter kicks, you got the the positive wire.
If it doesn't then you grounded both inputs which should not affect the inverter, in that case pick the other wire and stick it in the + input instead.
Last edited by DP; 11-15-2008 at 08:16 PM.