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This is a total shot in the dark, but I noticed above that you mentioned trying use a tail light mounting screw as your grouding point for the converter box. Not sure about the monty, but on some vehicles those screws go into threaded plastic clips instead of bare metal. Just a thought.

Make sure when you're testing the connector that your test light is clamped onto the bare ground pin on the connector, NOT onto the frame or bumper.



The ground is sandwiched between the sheet metal and the threaded clip the screw threads into. I tested the connector just as you described by clamping the light to the ground pin.

I am almost wondering if the convertor box is damage? it is not impossible, but the inconsistent results has been real baffling in this process. Does anyone see anything wrong with having to use the turn signal wire for my brake light?

91 Montero LS "Sandstorm", Auto, Dual Bouncy Seats, 2" Suspension lift, 2" Body Lift, GENII front IFS, 32" MT tires

89 Raider "Trailbreaker", 3.0, Auto, Dual Bouncy Seats