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I have a 81 scrambler. We replaced a 83' in line 6 out of a cherokee, with an 82'. The motor turns over, but does not fire. No spark at the plug. we have juice at the coil and distributor. I have 2 ground wires not connected. 1 comes from the ecm inside cab ( black w/white stripe), and a purple one coming from little black box above electrocic module. Any suggestions as to where they go. I know they are important.

Than you

Trevor