My 57 GMC uses a simple switch inline, with posts for 2 wires. It is in the line going to the rear wheels. Available at any flaps. Just need a T fitting.
57 GMC LCF 370 55 John Deere 40-W 59 John Deere 430-W 2000 GMC 4x4 56 John Deere 420-W Pix on Photobucket
