C850 ignition issues
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Joined: Jul 2019
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C850 ignition issues
So we got the carb back in the firetruck, but now it won't start. We have fuel, air and spark. We figure we must have moved a wire or something under the dash while putting the clutch cylinder, brake cylinder, and emergency brake back on. Only after turning it over and moving the key from on to off the starter kicks backwards. So we want to check out the wiring around the ignition but need a diagram. Unless someone had heard of this reverse starter issue before and can point us in the right direction. Nothing else was messed with since we had it running and pulled off the carb to rebuild it.
Mountain Pass
Joined: Jul 2018
Posts: 160
Likes: 4
From: Kentucky
If the engine kicks back when turning the key it sounds like you're getting fuel into the cylinders and the coil is firing once as you turn the key off.
Get yourself a meter or a test light and see if the power to the coil is going on and off when you crank the engine.
Other than permanent magnet starters (mostly for small engines or gear reduction starters) you'd have to monkey around with the wiring inside the starter itself to reverse one. Even if you managed to do that it wouldn't engage the flywheel.
Get yourself a meter or a test light and see if the power to the coil is going on and off when you crank the engine.
Other than permanent magnet starters (mostly for small engines or gear reduction starters) you'd have to monkey around with the wiring inside the starter itself to reverse one. Even if you managed to do that it wouldn't engage the flywheel.
Fleet Mechanic
Joined: Dec 2005
Posts: 1,602
Likes: 44
Haven't heard of a backward turning starter yet? I would turn key on test the resistor should be a bright
light (comming from the ignition switch the other terminal on resistor should be a dim light. on the test
light. Take the "I" wire off the solonoid now jump that to battery + fat cable on solenoid, now that dim side
of the resistor should glow bright 12vts. thats how the solenoid works it shoots 12vts to the resistor for
starting. then when it starts the coil returns back to lower volts. I have ran into this before. sometimes a
bad ignition switch or bad solenoid or botth. I can't see where replacing clutch and brake has anything
with wires unless the ignition switch plug got moved and not fully into the switch. Turning Ignition on and
off and the starter kicks backwards? I think there is a cylinder charged and at the right moment that cylinder
gets fire, like a model T free start the test light ya best friend......sam
light (comming from the ignition switch the other terminal on resistor should be a dim light. on the test
light. Take the "I" wire off the solonoid now jump that to battery + fat cable on solenoid, now that dim side
of the resistor should glow bright 12vts. thats how the solenoid works it shoots 12vts to the resistor for
starting. then when it starts the coil returns back to lower volts. I have ran into this before. sometimes a
bad ignition switch or bad solenoid or botth. I can't see where replacing clutch and brake has anything
with wires unless the ignition switch plug got moved and not fully into the switch. Turning Ignition on and
off and the starter kicks backwards? I think there is a cylinder charged and at the right moment that cylinder
gets fire, like a model T free start the test light ya best friend......sam
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