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Old 02-09-2013, 01:17 PM
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Solenoid only works with output wire disconnected

I am trying to get my Western plow working now that we got ten inches of snow! It has me completely baffled. The plow itself it fine and works properly. The issue is getting power to the pump motor. I have twelve volts to the input side of the solenoid. When I trip the solenoid I don't have any power to the output side of the.solenoid. If I unhook the output wire from the solenoid to the pump then I get twelve volts to the output side of the solenoid. If I touch the power wire from the pump to the battery the pump runs and the plow lifts and turns as it should.

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Old 02-09-2013, 02:12 PM
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Solenoid is junk, can not handle the current. If you can jump across the big terminals on the solenoid and the pump runs it is the solenoid for sure. Any Ford style solenoid will work for you.
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Old 02-09-2013, 02:18 PM
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Solenoid is junk, can not handle the current. If you can jump across the big terminals on the solenoid and the pump runs it is the solenoid for sure. Any Ford style solenoid will work for you.
Its a brand new solenoid (not saying its not bad). Wouldn't it still show 12 volts to the output side of the solenoid when the output wire is connected? It shows twelve volts to the output side with the output wire disconnected.
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Old 02-09-2013, 02:28 PM
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Its a brand new solenoid (not saying its not bad). Wouldn't it still show 12 volts to the output side of the solenoid when the output wire is connected? It shows twelve volts to the output side with the output wire disconnected.
Could also be a bad connection on the input side that cant supply current under load. Check the voltage on the input side while the output is still connected and you activate the plow. Could be a bad feed. If you jump the two large wires on the solenoid and the pump doesnt run the feed is no good. This is effectively what the solenoid does.
how is the solenoid feed connected to the battery. I would be very suspicious of this connection if the later test does not run the pump
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Old 02-09-2013, 02:47 PM
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Could also be a bad connection on the input side that cant supply current under load. Check the voltage on the input side while the output is still connected and you activate the plow. Could be a bad feed. If you jump the two large wires on the solenoid and the pump doesnt run the feed is no good. This is effectively what the solenoid does.
how is the solenoid feed connected to the battery. I would be very suspicious of this connection if the later test does not run the pump
I checked all my connections over and over again. After I posted my last reply I Went out and decided to check everything again. I took the input cable loose from the battery and there was some rusty washers between the input to the solenoid and the battery terminal clamp. I removed the washers and put the on the other side of the input wire from the solenoid. I found my gremlin! I was so happy when the pump kicked on and the plow moved. Thanks man. Now to move all this damned snow...........
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Old 02-10-2013, 07:54 AM
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Now next time it snows, you have to drive over here to plow me out.
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