I did a relocation in my S30 I have 0 gauge wire running up to the starter post and 0 for a ground wire connected to a bare metal rear bumper mount. I agree with previous posts, I think it’s a ground issue. If you wire brush to bare metal your Batt ground and add an additional block to frame ground strap you should be fine, make sure to spray it with that red stuff that comes in a yellow can (batt terminal protector). As for the spark, if the ignition is on and the motor cranks just a little bit you should be getting a spark. In the on and start pos the coil and P/U are getting power and should light off if the motor is cranked.