Re: Maybe dumb question

Posted by Steve@Advance on December 12, 2018 at 19:32:25 from (66.169.147.211):

In Reply to: Maybe dumb question posted by Grandpa love on December 12, 2018 at 17:43:03:

If this is the tractor you just bought, and have no history on it, best to assume nothing.

Do some investigating first.

Look at the electrical system as a whole.

Is there a generator or alternator? If alternator, almost certainly it has been converted to 12v negative ground. Very important to only connect the battery negative ground!

If a generator, look it over carefully. Try to find some numbers, a brand, a voltage, some clue to what the voltage is. Same with the regulator, try to find some information on it. Most part numbers can be searched online to determine the voltage. The generator will need to be polarized to match the battery polarity, but we'll need to know what generator it has to get the proper procedure.

Look at the coil, if it is a 6 volt, and there is no resistor ahead of it, it is still set up for 6v. Look at the primary wiring to the coil. If the - terminal is connected to the distributor, it is wired for negative ground. This is not critical, it will run wired either way without damage. Just be sure when the final decision is made, positive ground system, the + terminal goes to the distributor, negative ground, the - terminal to the distributor.

If there is a ceramic resistor ahead of the coil, it has been converted to 12v. If the coil has a part number, look it up, see if it is a 6v, a 12v that needs a resistor, or a 12v that does not need a resistor. If no part number, check the resistance across the + and - terminals out of circuit. If it is around 1.5 ohms, it needs a resistor to operate on 12v. If 3 ohms, it is a 12v that does not need a resistor.

As for the starter, it will run the right direction regardless of the polarity. If it is a 6 volt starter (it probably is), it will work on 12 volts. Just be aware it is 6 volt and don't crank for extended periods of time. Most 6v starters work well on 12v, but be aware it will be slamming the drive into the flywheel gear much harder than if on 6v. Some handle it well, others don't, depends on the design of the starter.

This may sound like information overload, but just take it one step at a time. Check what you can, write down the results, post back what you find. We'll get this sorted out.

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