My machine is a 2010 Scag Tiger Cat (48") with about 800 hrs. Machine initially would not start and now is burning out electrical components. Been working on it for about a month (grass is getting pretty long). Here is what I've done so far:
1--- New battery
2--- Checked and cleaned all terminal connections (verified good contacts by ohm and volt meter)
3--- New starter solenoid
4--- New ignition switch
5--- New PTO switch (twice)
6--- Replaced (twice) same 20 amp fuse
7--- New voltage regulator
8--- Bypassed ignition relay.
9--- Checked ECM (good ground from green/black wire)
Initially, engine starter circuit was simply sporadic. Turning starter switch would not always immediately charge starter solenoid. This is pretty common in this humid environment and I either disassemble switch and clean contacts or replace switch. The problem worsened until engine would not start. No power thru green/white wire. Replaced starter switch after checking all contacts (no improvement). Did normal things as noted above. Made simple jumper wire to start engine (hot pole on solenoid touches to green/white wire terminal for coil). Then engine quit while mowing. Battery not charging. Stator @ 29 vac and all connections good. Replaced voltage regulator. Charge back to 14+ vdc. Back to mowing. Blew 20 amp fuse. Replaced fuse. Mowed for about an hour and PTO switch went bad. Ordered new PTO switch. While waiting for new PTO switch, worked on ignition system. Although I could hear the ignition relay (with diode) click when trying to start engine, contact between red/yellow and green/white wires was not happening (ohm meter). Ordered new ignition relay with diode. PTO switch arrived and installed. Until the new ignition relay comes, I installed a simple spring return on-off switch between red/yellow and green/white wires to eliminate need for jumper @ starter solenoid. Engine started right up. Drove around for about 15 minutes then started to mow. Blew PTO switch in first half hour. More than a little frustrated. Suspect internal wiring in electric clutch but figure problem began with the starting circuit (clutch disengaged). Sorry to carry on so but I just read posts on electrical problems and figured the more information provided would save some time. I did get under the clutch but didn't see any chafed wiring. Sure appreciate any advice
1--- New battery
2--- Checked and cleaned all terminal connections (verified good contacts by ohm and volt meter)
3--- New starter solenoid
4--- New ignition switch
5--- New PTO switch (twice)
6--- Replaced (twice) same 20 amp fuse
7--- New voltage regulator
8--- Bypassed ignition relay.
9--- Checked ECM (good ground from green/black wire)
Initially, engine starter circuit was simply sporadic. Turning starter switch would not always immediately charge starter solenoid. This is pretty common in this humid environment and I either disassemble switch and clean contacts or replace switch. The problem worsened until engine would not start. No power thru green/white wire. Replaced starter switch after checking all contacts (no improvement). Did normal things as noted above. Made simple jumper wire to start engine (hot pole on solenoid touches to green/white wire terminal for coil). Then engine quit while mowing. Battery not charging. Stator @ 29 vac and all connections good. Replaced voltage regulator. Charge back to 14+ vdc. Back to mowing. Blew 20 amp fuse. Replaced fuse. Mowed for about an hour and PTO switch went bad. Ordered new PTO switch. While waiting for new PTO switch, worked on ignition system. Although I could hear the ignition relay (with diode) click when trying to start engine, contact between red/yellow and green/white wires was not happening (ohm meter). Ordered new ignition relay with diode. PTO switch arrived and installed. Until the new ignition relay comes, I installed a simple spring return on-off switch between red/yellow and green/white wires to eliminate need for jumper @ starter solenoid. Engine started right up. Drove around for about 15 minutes then started to mow. Blew PTO switch in first half hour. More than a little frustrated. Suspect internal wiring in electric clutch but figure problem began with the starting circuit (clutch disengaged). Sorry to carry on so but I just read posts on electrical problems and figured the more information provided would save some time. I did get under the clutch but didn't see any chafed wiring. Sure appreciate any advice
SCAG TIGER CAT ELECTRICAL PROBLEM
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