case 420CT lost all electrical

[Lfickau]

was running the skidsteer and I shut off with the key. Went to start back up and all was dead at the instrument panel. Battery and battery cables checked out fine 12+v. Have power at the jump terminals. Remove instrument panel and checked for power at plug pins (no power found). no power at pull out fuses in fuse block next to seat. have power at the 3 small electrical (looks to be circuit breakers) the bar that ties them together located just behind the fuses. no power at the alternator.

 

[Lfickau]

UPDATE: Do have power at alternator and at what I think is the starter relay on one of the larger red cables located left side of chassis just inside the side inspection cover. Dose anyone have a wiring diagram pdf Is there a way to get this into my shop, raise the boom and tilt the cab to better access the wiring.

 

[Tazza]

UPDATE: Do have power at alternator and at what I think is the starter relay on one of the larger red cables located left side of chassis just inside the side inspection cover. Dose anyone have a wiring diagram pdf Is there a way to get this into my shop, raise the boom and tilt the cab to better access the wiring.

Could the key switch be bad?

 

[Lfickau]

Could the key switch be bad?

Can not be that because I dont have any power going to the switch. Called dealer service were I purchased it. He told me to check the disconect switch at the jump lugs. they have had some fail. Told to remove ground wires from switch and bolt them together if this fixes the problem it would be a bad diconect switch. Im going to give that a try to night.

 

[Lfickau]

Can not be that because I dont have any power going to the switch. Called dealer service were I purchased it. He told me to check the disconect switch at the jump lugs. they have had some fail. Told to remove ground wires from switch and bolt them together if this fixes the problem it would be a bad diconect switch. Im going to give that a try to night.

UPDATE: I connected the ground cables off the back of the disconnect switch This did not fix the problem. still have not power to the fuse block or to the key switch, and no power to the instrument panel. anyone know of a wiring schematic in PDF I can take a look at.

 

[Tazza]

UPDATE: I connected the ground cables off the back of the disconnect switch This did not fix the problem. still have not power to the fuse block or to the key switch, and no power to the instrument panel. anyone know of a wiring schematic in PDF I can take a look at.

Does this machine have a main fuse from the battery? Bobcat have a big fuse that will shut ALL power off to the machine, could it be the same for you?

 

[Lfickau]

Does this machine have a main fuse from the battery? Bobcat have a big fuse that will shut ALL power off to the machine, could it be the same for you?

That is what I'm looking for. There are on the left side chassis just below the inspection cover are two electrical components which is a starter solenoid (pt# 87406968) and a circuit breaker (PT# 87049195). Tomorrow I'm going over to the dealer service and look at their wiring schematics. I need to find out how the battery feeds power to the fuse block. The Big Problem with this is it is very hard to access anything because I cannot raise the boom so I could tilt the cab and get easy access to wiring and there components.

 

[Gearclash]

That is what I'm looking for. There are on the left side chassis just below the inspection cover are two electrical components which is a starter solenoid (pt# 87406968) and a circuit breaker (PT# 87049195). Tomorrow I'm going over to the dealer service and look at their wiring schematics. I need to find out how the battery feeds power to the fuse block. The Big Problem with this is it is very hard to access anything because I cannot raise the boom so I could tilt the cab and get easy access to wiring and there components.

If you have access to a safe lifting system, in theory you could pull the manual release for the arm hydraulic circuit, hold the arm control lever in the lift position, and lift the arms that way.

 

[Lfickau]

If you have access to a safe lifting system, in theory you could pull the manual release for the arm hydraulic circuit, hold the arm control lever in the lift position, and lift the arms that way.

Your correct by pulling release (Rt side by throttle lever) you can lift the boom with an overhead lifting equipment. Then engage the safety bar. Once you get it running you can bring it back down. NOW THE ELECTRICAL PROBLEM AS BEEN SOLVED! A poor connection in the multi pin plug located under the left control stick. Remove cover that protects the wire loom (two 8mm bolt from out side of cab). There are two plugs one round and one rectangle. The rectangle is were the problem is. At this point I remove the plastic protective cover on the plug and wiggled the wires and power was restored to the ignition switch (on legend #7 pin location C in frame 1). I was able to start the skid steer and get it in to my shop. In shop I raised boom and tilted cab for better access to all electrical. Removed left cap support cylinder. in the center of the multi pin plug is a bolt with a 8mm hex head this will separate the plug. on the round plug twist the outer ring will separate this plug. Now you may easily remove the loom and inspect pin connections. A1 the lower left hand corner ( see frame 1). Cleaned and applied Di-electrical Grease. Reassemble and tested that I had power at the ignition switch. The Moral of the story is if you have power at (on Legend #4) the circuit breaker (on frame 1) 130A R-2.0 and you do not have power at (on legend #7) ignition switch (on frame 1) C then it is the wiring between them but most likely the Multi pin plug. If someone can tell me how I will provide a JPEG of Frame1,Frame2, and Legend

 

[mmsllc]

Your correct by pulling release (Rt side by throttle lever) you can lift the boom with an overhead lifting equipment. Then engage the safety bar. Once you get it running you can bring it back down. NOW THE ELECTRICAL PROBLEM AS BEEN SOLVED! A poor connection in the multi pin plug located under the left control stick. Remove cover that protects the wire loom (two 8mm bolt from out side of cab). There are two plugs one round and one rectangle. The rectangle is were the problem is. At this point I remove the plastic protective cover on the plug and wiggled the wires and power was restored to the ignition switch (on legend #7 pin location C in frame 1). I was able to start the skid steer and get it in to my shop. In shop I raised boom and tilted cab for better access to all electrical. Removed left cap support cylinder. in the center of the multi pin plug is a bolt with a 8mm hex head this will separate the plug. on the round plug twist the outer ring will separate this plug. Now you may easily remove the loom and inspect pin connections. A1 the lower left hand corner ( see frame 1). Cleaned and applied Di-electrical Grease. Reassemble and tested that I had power at the ignition switch. The Moral of the story is if you have power at (on Legend #4) the circuit breaker (on frame 1) 130A R-2.0 and you do not have power at (on legend #7) ignition switch (on frame 1) C then it is the wiring between them but most likely the Multi pin plug. If someone can tell me how I will provide a JPEG of Frame1,Frame2, and Legend

Good job on finding the problem. Mad cool points go to you for that. Most of the time electrical is somewhat hard to accurately diagnose, repairing after that is usually far easier. Electrical repair, overall, can be increasingly difficult. Be glad that your machine seems to be quickly repairable.