both the 12v and 03 have 2 wire ac coils, 1 positive. and 1 negative,and simple ohm test will determine which is which, if the 12 valve was a 94 and up then the compressors were basically the same, some clocked a little different, but will interchange. If you are having to jump across the relay or put power to the coil for it to engage, your problem is else where, low on freon, bad cycle switch etc......
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