[tstang90]

I just picked up a used blue crusher I converted it to 12v. I pig tailed a pw 12v plug end into the harness/ With white being the pos lead like my other pw vehicles. The shifter when put into rev goes fwd and fwd goes in reverse..
Am i missing something here??

I just did the 6-12v swap in a lil mcqueen not a super 6 but it worked out great. That car also didnt have rev but it went fwd when you hit the button to go.
Thanks

[Nighthawk]

Try reversing the polarity of the battery. It sounds like you have the + and - terminals backwards.

[bruces_eviltwin]

yes white is positive, did you have the wires off the motors? perhaps they are reversed?