Quote:
Originally Posted by Cannon51
I think there is a wire that runs from the starter solenoid to the fuel solenoid that opens the fuel solenoid in the start cycle. I believe there is a diode in that wire to keep power from feeding back through the wire in "Run". If that diode failed would the starter solenoid be activated in 'Run"?
Cannon
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That is correct. A diode is a current flow directional device. The diode (circled in red) allows current to flow from the starter's battery cable lug thru the fuel solenoid when the starter solenoid is activated (key in "start" position). Then when the key is released to the "run" position, the diode prevents current from flowing back towards the starter motor.
Usually when diodes fail, it is because they burn out (go open). In this case the diode would appear to be shorted.
To verify this, the diode lead will have to be removed from the starter, then apply 12 volts to the "R" terminal of the key plug. Use a test light, connect the alligator clip to battery ground and probe the lead removed from the starter. If it lights, you have a shorted diode.