This is the Compustar FT-DM600 door lock harness with polarity inverter.

It does two useful things, and the second is arguably the better reason to buy it.

1. It flips polarity. Compustar products output negative by default. Where a vehicle has a positive trigger door lock circuit, this converts it to a low current positive trigger, and it's easier to fit than building the same thing out of relays. Fewer vehicles need this than used to, now that most require an interface module, but they still exist.

2. It includes the door lock harness Compustar don't sell on its own. That harness frees up the programmable outputs you were using for lock and unlock, and gives you the priority unlock output as well. If that's all you're after, cut off the polarity inverter and you have the harness. We have no idea why Compustar don't sell it separately, but this is the next best thing.

See our full range of relays and relay harnesses, or call us on 647-439-4485.