I have been trying to figure out why the overdrive on Dads 50 Champ is not working. The car has been converted to 12V Neg ground. As part of the conversion I purchased a reproduction 12V relay and solenoid from Fifth Avenue Garage.
I think I have traced the problem to the overdrive relay, so I pulled the relay out to bench test it. It is not working the way I expect it to but I can't find a schematic that shows how the relay coil and contacts are connected internally.
My understanding of this relay is that one side of the relay coil gets its ground from the governor. The other side of the coil gets power when the ignition switch is on. The normally open contact gets power through the 10 wag wires coming directly from the battery post on the starter solenoid. The other side of the contact connects to the OD solenoid.
So on the bench I connected the post that normally connects to the governor, to negative 12V. I then connected the post that would normally connect to the ignition switch, to positive 12V. I expected to hear a click and feel the thud of the relay picking up. I got nothing.
Am I correctly understanding the operation of this relay?
I think I have traced the problem to the overdrive relay, so I pulled the relay out to bench test it. It is not working the way I expect it to but I can't find a schematic that shows how the relay coil and contacts are connected internally.
My understanding of this relay is that one side of the relay coil gets its ground from the governor. The other side of the coil gets power when the ignition switch is on. The normally open contact gets power through the 10 wag wires coming directly from the battery post on the starter solenoid. The other side of the contact connects to the OD solenoid.
So on the bench I connected the post that normally connects to the governor, to negative 12V. I then connected the post that would normally connect to the ignition switch, to positive 12V. I expected to hear a click and feel the thud of the relay picking up. I got nothing.
Am I correctly understanding the operation of this relay?
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