Car does not go backwards after spider install

[rycexboi]

Does anyone have a clue why my car can't go backwards?, I just installed the spider v4.0. Everything else works fine and when I try to go backwards, it stutters back for a sec and stops.

P.S out of the blue/yellow/orange/green wire, which one associates with the car going backwards?.

[firebird999]

all do that. you have to press reverse, let up, then press again. it's a common problem for xmods.

[zippo855]

sounds to me like you have a bad solder joint, and it should be one of the 2 wires on the back fet location that controls reverse, have you check continuity?