I wanted to rewire my tractor. I wanted to do away with all of the disconnected and deteriorating wires and do away with the lights. So I eventually pulled the old harness out. My extension is to have my own master switch with a push button start and various toggle switches for accessories like a radio, cig lighter, etc. Well when I went to jump the terminals on the starter and it ran backwards thus not allowing the armature to throw outward to engage the flywheel of the tractor. I took the starter off and took it apart and noticed only two wires in each side of the housing. I thought about cutting these wires and switching them around but I have no idea if this would work. Can anyone help. Thanks
- Thread starter arbtmn
- Start date
Steve@Advance
Well-known Member
Check the starter rotation again, it should run the same way with either polarity.
I suspect a bad starter drive, low battery, or a bad battery cable or connection.
I suspect a bad starter drive, low battery, or a bad battery cable or connection.
I have no experience with a 750, don't know what it is. If a 750 is a lawn tractor with a small engine (lawn tractor type), it may have a permanent magnet starter like most small air cooled engines have. A permanent magnet starter will run backwards if the battery polarity is backwards, unlike a standard field coil starter that will run the correct rotation no matter what the battery polarity may be. See if you have the battery connected backwards OR if the battery has been charged backwards either will turn a permanent magnet starter backwards.
There's two versions of the 750, starter, by serial number, as far as I can tell neither is a permanent magnet starter, and BOTH are positive engagement starters, meaning an electromagnet moves the drive into place.
You need to back up a bit and take another look at this... your starter is NOT running backwards, and even if it were, the starter drive would move out and engage with the flywheel, but of course, it wouldn't crank, because of the overrunning clutch on the starter drive.
You must be powering the starter so it runs and NOT powering the solenoid/electromagnet the should be moving the drive into the engages position, IMHO.
You need to back up a bit and take another look at this... your starter is NOT running backwards, and even if it were, the starter drive would move out and engage with the flywheel, but of course, it wouldn't crank, because of the overrunning clutch on the starter drive.
You must be powering the starter so it runs and NOT powering the solenoid/electromagnet the should be moving the drive into the engages position, IMHO.
Very good responses. When Vic says "why," it makes me wonder myself - why the hell am I taking something that works perfectly well and rip it apart - HA. I just wanted to embark on a project for myself and customize my own panel and wiring, thats all. I think I will go back and try different scenarios. I do not think I am powering it properly or that it is not getting enough electricity or something along those lines. Battery is fully charged. Initially the way the tractor was made, the positive wire from the battery was grounded to the tractor and the negative connected to the starter - backwards. So i left that alone and tried it and no engagement and then i switched the terminals aroung with normal ground wire grounded to the tractor and still no engagement. What can I do to power it differently? I have the standard pigtail and I have the post for the battery cable.
I forgot to mention and this may be the answer. I have no idea what 2 small wires did that plugged into the starter motor at the bottom. Could this be the answer? I totally unplugged these 2 small wires. Perhaps this is what makes the armature spring outward when power is applied to these wires. Please look up the part and not the picture. This 2 wire harness plugs into the bottom of the starter.
Well I finally figured the starter out and am now on the way to totally rewiring the 750 with my own panel set up with gauges, push button starter, battery switch, etc. There was a small plug under the starter where a wire once was. Apparently this was the solenoid wire. So Bob was right it was not turning backwards - it was not engaging due to not having 12 volt power running to the solenoid. So when I touched the terminal of the battery with this small wire it fired right up. So that takes care of that. As far as the alternator, since it is putting out ac current can I splice one or both wires coming off of the alternator and route both or one of them to a battery terminal? I just do not have confidence that it is actually charging while running to a Voltage Regulater and then back to the battery somehow. I do not see evidence of voltage increases in the battery after I start it. Thanks
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