I have a 2006 Cat 315C trackhoe, it recently started not to shut down when I turn the key off, I immediately assumed it

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Customer: I have a 2006 Cat 315C trackhoe, it recently started not to shut down when I turn the key off, I immediately assumed it was the sylenoid, how ever after installing the new synlenoid, I was able to determine by testing the new synlenoid and the old one also that they are actually working. I have a fuse blown, and I keep blowing a fuse everytime i put one in. I was afraid I was hooking the synlenoid up wrong. I am assuming the red wire would go to poss, black to neg, with the jump wire off the black wire to frame. When I do this I immediately blow the fuse. Sounds like a ground?
Answered by Daniel Wilson in 13 mins 9 years ago
Daniel Wilson
Auto Mechanic

20,016 satisfied customers

Specialities include: Auto Body Technician, Heavy Equipment Repairs, Diesel Engine Repairs, Brake and Transmission Repairs

Hi my name isXXXXX will try to help.Reply back if you still need help and ill be glad to help.


This is a description of the start and stop circuit.


Start/Stop Circuit Schematic
(2) Battery. (10) Starter control relay. (11) Starter switch. (12) Neutral start switch. (19) Starter motor. (20) Starter relay. (21) Alternator. (25) Shut down solenoid. (29) Timer relay. (30) Neutral start relay. (42) Starter solenoid. (43) Shut down timer.

When starter switch (11) is placed in ON position (39) with the hydraulic activation control lever in LOCKED position, there is current flow through timer relay (29) and neutral start switch (12) to neutral start relay (30). The coil of neutral start relay (30) is energized to be ready for the start operation. When starter switch (11) is placed in START position (40), there is current flow through neutral start relay (30) to starter relay (20). The starter relay contacts are closed and there is current flow to terminal S of starter solenoid (42) from starter relay.

NOTE: If switch (11) is placed in the ON position with the hydraulic activation control lever in UNLOCKED position, no current flows to starter relay (20) and the engine will not start.

When current flows to terminals of starter solenoid (42), contacts are closed and strong current flows from (+) terminal of battery (2) to B terminal of starter solenoid (42), which rotates motor (19) to start the engine.

Once the engine starts, alternator (21) begins to generate electricity. Current signal is sent from P terminal of starter control relay (10). Terminal S of starter control relay (10) opens to turn the coil of starter relay (20) OFF. Starter motor (19) stops its rotation, which prevents the motor from being damaged due to over rotation.

When the starter switch is placed in OFF position (41), shut timer timer (43) supplies power for a certain period. Shut down solenoid (25) starts to move and stops fuel supply to the engine for 6 seconds, which stops the engine. After the 6 seconds is over, the governor actuator opens fuel rack to make restart possible. If starter switch (11) is placed in the ON position before the 6 seconds pass, the governor opens the fuel rack at that time.

When I downed the machine I could start the machine and could achieve full throttle, but now when i start the machine I have lost the ability to throttle full rpms, all I have is low idle. What would you suggest next, since I stated I am sure I have a ground some where, thanks in advance.

Check behind your seat for the back up switch. See if the flicking the switch will have any affect on this problem, Check all your fuses, harness, and relays. Let me know

ok I appreciate your help this late at nite, I will let you know, thanks again.

Anytime Greg. Im off for the night but I log in periodically throughout the day in between jobs. Let me know.
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Daniel Wilson
20,016 satisfied customers
Auto Mechanic
Daniel Wilson
Auto Mechanic

20,016 satisfied customers



Licensed mechanics

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