Re: 1975 85hp mercury thinderbolt blueband wires and distributor cap
There could be a reason they dont service anything earlier then 87, they simply may not know how to work on them or to lazy to learn, you can probably find a new internal wiring harness here at iboats, the distributer you will probably have to google or go to ebay, there are several websites with the parts schematic that you need for p/n's.