I just purchased a used GT7 speed control for my sons 19 turn car, we previously bought new a GT7 thats in his stock rubber car. my question is
the new one we bought has 2 black, one blue, one red wire, the used one we bought only has 2 black and one red wire, how in the heck do I hook this unit up. Sorry if it`s a dumb question but we`re noobies here.
First off Jerry, the only dumb question is the one not asked. If you look on the case of the speedo, it'll say which wire is which. The red wire is the battery and motor + lead. One of the black wires is connected to (mot -) and the other is connected to (bat-). Just hook them up accordingly. Make sure to look on the case of the speedo to be sure which wire is which. Also, just to be safe, I'd change the motor - wire to a different color like blue or something along those lines. You don't want to mistake which is which and wonder why the car doesn't move and there's a plume of smoke coming out of the speedo...
So let me get this straight, the red wire goes to both the mot + and bat +, do I have to split this wire correct? That what I gather, also I have the instructions on my other speed control, but they list the blue wire which I do not have.