the 3speed has a side mounted PRNDL switch, if the input is 12vdc is good and the R pin is dead. the switch is bad. 12vdc ,good, 0v bad, or If like 3- 6v the reverse feed is shorted.
most can be dismounted and cleaned.
item 18 here
see page 6 for schematic of it
http://www.fixkick.com/power-elect/95%20...mps95b.pdf
most can be dismounted and cleaned.
item 18 here
see page 6 for schematic of it
http://www.fixkick.com/power-elect/95%20...mps95b.pdf
http://www.fixkick.com