I'm finishing up my ground up build. Two days ago, I started her up for the first time and it ran, idled, etc. perfectly. Yesterday, I ziptied the wiring harness and everything and was about to put on the front plastics when I decided to fire it up again. Nothing. The starter solinoid clicked and it didn't do anything and the reverse light came on. The fuel pump primes up and everything. What could be the problem?