heres the deal, my stock 4.0L threw a rod. picked up another 4.0L out of a 96 cherokee. I rebuilt it and put it in. just finished it up today and when I tried to fire it up and it would turn it over but wouldn't start. I narrowed it down to spark and then found out there is no power coming out of the harness where the harness plugs into the coil. everything worked when I pulled the old motor. I've checked fuses. any ideas?