If you are installing the JD halogen work lights it doesn't matter. If you are installing your own LEDs it does matter. You definitely want to verify everything with a meter. When hooking up my LED lights I found on the one side purple was ground and on the other side black was ground. Go figure.

PJR832 said:

I just went through this about 6 months ago, I believe it is the purple but a test light will get you there.

Click to expand...

Not always. One pair of my wires was black/negative and the other pair was purple/negative. The halogen lights didn't care but when I installed LED lights it was a problem. Best advice is to always verify the polarity before making permanent connections.

martincom said:

Black is negative (ground) and purple is positive.

Click to expand...

No... it was the harness. When the one light didn't work I checked the harness with a voltmeter and discovered JD had installed the one branch wire pair backwards. I resoldered the connectors on the lights to match.

martincom said:

I'd be more inclined to believe that one of your LED lamps was mis-wired.

Click to expand...