Having participated in 2 conversions, and being the owner of 2 Solectrias, I have learned the some lessons. The list will grow.

1. The wiring harness is a BIG DEAL. It often takes much more time that the motor / battery installation. Depending on the complexity of a wiring harness, or if one is purchased, it is better to breadboard and run the entire system on the bench before installation in the vehicle. Especially, if it is a first time conversion. Running the system and understanding it, is important. The difference is that, on the bench, the drive motor does not see the inertia of the vehicle weight. This relates to regenerative braking.

2. I hooked up a battery pack with 10 gauge wire for testing, and used open connectors (2 prongs). Closed connectors (circular) work better, because the ends do not spread.

3. I saw a battery terminal that was melted on 2 occations, and of course, an open circuit. Culpret - undersize cables from WalMart, and an torqued bolt. Lesson: Don't scrimp on the wire gauge. Some suggest using a belleville washer, to assure good contact.