Mike, you'll collect much more information if you supply a little more. Instead of appealing to just those familiar with your Ion Reention bike (I've never even heard of one), and how it's wired, maybe supply a little more info about what you are doing and some higher quality photos.
I'm left wondering-
Does the bike have a throttle now? Are you sure it's able to use a throttle? What brand motor? Hub drive or mid drive? A CLEAR picture or 2 taken from the rider's seat would be a big help as well.
And last, you need to realize some bikes are not able to use throttles due to motor design....
Best of luck.