Posted by Red Mercury on July 12, 2014 at 12:51:31 from (204.112.28.72):
In Reply to: My New Old H posted by Jon Lemke on July 12, 2014 at 09:57:48:
I agree with the other posters as well about the possibility of the battery cables. Generally, the battery voltage will drop somewhat when any vehicle or tractor is being cranked. That is also a reason why good heavy cables are so important. If you have small or poor battery cables on a tractor you can easily be losing volts across the cables any time a large amount of current is flowing through them, such as 75 Amps of starting current (typical starting current for some motors). For example on a 6 volt system with bad cables you might be dropping 2 volts across the cables, leaving 4 volts or less at the starter. This is where a system converted to 12 volts can "hide" the bad cable problem somewhat because in that case, 12 volts with 2 volts cable loss still gets you 10 volts at the starter to start your tractor......and if you are running the 6 volt starter with a 12 volt battery it will be more than happy with the 10 volts.
When I first got a few old tractors, several of them had smaller gauge cables that would have likely been the smallest and cheapest ones at the local supply store or else used ones from a car/truck. I now get heavy cables made up at an electrical shop with the proper ends crimped on. It's like night & day difference.
Red
Electrical Engineering Technologist, in the business for 26+ years.
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