I have a 56 GMC 100 which I am rewiring and have a question for all about an abbreviation found on the wire for the temperature sending unit mounted on the engine block. The schematic shows "18 F - (H.W.)" for the wire going from the engine mounted sending unit to the temperature gauge.
Does anyone have an idea what "H.W." stands for? It is the only wire on the schematic with that abbreviation.
