Alright so my idiot buddy hooked my battery up backwards when we were trying to boost it fried my altenator burned some wires cooked the computer great eh? so i was wondering how far the damage would be should i replace the whole harness? so far i have lost turn signals my heater fan some of my guages i got the spedo back when i switched the computer. also i replaced the first bit of the wires that come off the firewall just past what i assumed were some type of inline fuse and i think that helped my altenator problem but it is possivle the spare i put in was a dud too, anyways what would you recomend? also the truck is a 1989 chev two wheel drive v6 5 speed