On a dark and rainy night yesterday, I used a borrowed battery to attempt to start my OMC 3.0 l, in my haste, I assumed the polarity was the same as my battery. With my nearly drained battery, I could run the electronics but was not turning over the starter. After my reverse polarity touch and attempted start, I am no longer getting any power to the electronics. I checked all 6 fuses for the electronics, the engine circuit breaker and two 20 amp fuses, everything is good. Next step?