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Old 11-28-2021, 08:55 PM
Bdpknox Bdpknox is offline
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Default 1863 fuel solenoid
Hello, I’ve got an 1863 which recently started having this problem. It will start and die after 1-2 seconds.

By accident, I discovered that if I keep the key on start, it’ll stay running. I suspect the starter is also still turning so not a good solution but that indicates it’s not a fuel pump/filter problem.

I’ve pulled the carb and find that the fuel solenoid will retract fine when I turn the key to lights, but the solenoid stops retracting when the key is in “run”, and when it’s in “start”, the solenoid fluctuates in and out. (I suspect this is maybe the starter drawing too much voltage and so not enough for the solenoid to stay open?)

Should the solenoid stay open through all the key cycles? I also see there is some kind of oil sentry marking on the motor. Is there something in that system that could be causing my trouble?
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Old 11-28-2021, 09:30 PM
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CubDieselFan CubDieselFan is online now
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There are 2 circuits that apply power to the solenoid. You losing the circuit for run mode. Do you have a wiring diagram?
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Old 11-28-2021, 09:34 PM
Bdpknox Bdpknox is offline
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I do have a diagram. I see there are a couple diodes on those circuits. Any guess on where they are located so I can check those along with the wiring?
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Old 11-29-2021, 03:41 PM
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Sam Mac Sam Mac is offline
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I just cut off the plunger on the fuel solenoids, problem solved.
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Old 11-29-2021, 10:23 PM
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Quote:
Originally Posted by Sam Mac View Post
I just cut off the plunger on the fuel solenoids, problem solved.
That works too.
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Old 11-30-2021, 05:16 PM
Bdpknox Bdpknox is offline
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Looks like it might be my new ignition switch from last year. It doesn’t have continuity between the the B and R terminals sometimes. Is there a replacement switch that’s better than others? I think this one came from amazon.
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Old 11-30-2021, 08:08 PM
R Bedell R Bedell is offline
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Quote:
Is there a replacement switch that’s better than others?
Just the correct one.

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Old 12-01-2021, 07:29 AM
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Originally Posted by Bdpknox View Post
Looks like it might be my new ignition switch from last year. It doesn’t have continuity between the the B and R terminals sometimes. Is there a replacement switch that’s better than others? I think this one came from amazon.
The Indak sourced OEM Cub switch would be considered the best.
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Old 12-01-2021, 09:23 AM
Frank1541 Frank1541 is offline
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Does the switch lose continuity between B and R when it is in the Run position?
It is normal for the switch to not have continuity between B and R when in the Start position.
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Old 12-01-2021, 12:20 PM
Bdpknox Bdpknox is offline
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Installed a new switch and it’s working fine now. Thanks for the help, I wouldn’t have thought the new switch would have failed so quickly. Got a legit switch from the dealer this time.
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