Re: 46 h wont crank

Posted by Marvin on October 26, 1999 at 13:45:22 from (134.134.248.23):

In Reply to: 46 h wont crank posted by tony on October 25, 1999 at 23:14:36:

This is where a voltmeter would come in very handy. You need to measure how much voltage you are getting at the starter when you are turning the key or pushing the button to start the tractor. You need to be carefule when making these measurements that you measure on the stud of the starter and not the cable that is connected to the starter. If you get 6 volts at the starter stud, then you more than likely have a starter problem, if you are getting much less than 6 volts at the starter then you need to walk backwards through the wiring to find out why.
The problem can be either in power side of the wiring or in the ground side. You need to measure at every connection point and check for voltage drop. Ideally you should have no more than 1/2 to 1 volt of drop from the battery to the starter when cranking it over. This is a pretty simple system so it hopefully can be diagnosed in an hour or less.
It is important when makiing measurements like this that you check the ground side for voltage drop. It is not good enough to measure from the ground (whether postive or negative) terminal on the battery to the stud on the starter and having 6 volts and say the battery and all of the wiring is okay. I would find a good ground connection at the starter and measure from that point to the stud on the starter to verify that I had my 5.5 to 6 volts there.
I just worked on my Super A and found that the starter was working poorly because the ground connection from the battery to the tractor frame was too high of a resistance when the starter was trying to run. I had to clean all surfaces with sand paper and bolt everything real tightly.
Good Luck and let us know what you find.

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