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The start switch ? Do you mean the starter relay your jumping the solenoid on the starter and it starts right but when your in the vehicle and you turn the key you get nothing right if this is correct the starter relay is no good when you turn your key in the steering column lock that moves the ignition switch on the steering column sending voltage to the relay then the relay sends it to the solenoid which then powers up the stater motor then it cranks the engine//// so the relay is bad
There is a safety switch on top of the brake pedal lever or clutch lever which is suppose to prevent lurching on start-ups. It is suppose to insure that the Brake pedal is pushed OR the clutch is down before the engine will crank.
The Ignition switch is interrupted by the above cutout switches. But when Ignition is turned on, the Glow plug timer should click and cycle if Power Relay is giving it juice. So if you do not hear that type of clicking, the glow plugs will stay cold.
I would check to see if power is going to the Power Relay above the glow plug timer, and if it is getting power, does the Power Relay send it to the Timer? The starting circuit is more involved in a Diesel because the fuel must be atomized by heating it for initial starts. But you must be getting this process if jumping the solenoid results in the engine starting.
Therefore the big test is whether the small wire to the starter solenoid is dead when a foot is pressing the Brake or clutch pedal when the Ignition key is in the STARTER position.
So either your Ignition switch is bad at the STARTER terminal position or the signal is interrupted by the anti-lurch Interlock switch. It is quite common for problems with this switch being hit and broken or displaced by the Drivers' feet.
There was also no indication of whether you jumped the solenoid on a warm engine which could atomize the fuel by compression or a very cold engine which needed the glow plugs to work.
Please comment on my info and report your success.
its getting fuel to the carb but is the solenoid working on the bottom of the carb they stick and also safety switches go bad and kill the power going to it
Well the good news is the click indicates the switch is working, when you press the switch the 2poles on the solenoide are joined together alowing the current to the starter,bridge the wires at the solenoide this should put power directly to the starter you wont need to press the start switch, if the engine does not turn over check the connections to both the battery and starter motor,
Assuming you checked fuses and followed wiring for any signs of a short or connector undone. You're getting power to starter, but solenoid sounds dead if you have to bypass it. If the engine spins but won't fire, I SUSPECT ingition problems. Encountered rain...is seal around ignition unit gone bad? That would splain the plug not firing. Do you smell gas (oops...petrol) when you crank the motor? fuel getting to cylinder? Check for water in fuel system.
I assume that you are jumping the solenoid in order to bypass an ignition switch that is no longer operating?
If so, did you have the key turned to the run position?
You should not need to bypass any safety switches, just be sure that everything is in the normal starting position. (deck disengaged, in neutral, etc.)
Either way, it sounds like you have a bad ignition switch, or faulty wiring between the ignition switch and the solenoid.
check starter solenoid.see if getting power to starter side when pressing button .if yes check if power to starter w/ test light when pressing button.if power there check starter,also motor, will it turn manually or is it seized.if no power to starter side of solenoid, jump across solenoid posts w/ a large screwdriver -motor will probaly turn over,w/ key on.if small wire to solenoid has power when pressing start,solenoid bad,if no power, wiring or start button bad.
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