Two standard relays are usually required to add power locks as an aftermarket modification, one on top (positive supply) and one on bottom (reverse polarity). This 451M simplifies wiring as it is two relays in one simple package. It comes with simple instructions and works like a charm when used with remote key and/or spring switch systems. One note: I'm very good with electronics and couldn't figure out how to get it to work with a 5 wire drive like this http://amzn.com/B00LURSUSG but it works fine with 3 wire drives .
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