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John Deere Tractors Discussion Forum
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Re: Follow Up: 6 to 8 volt Cold Starting

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Author 
buickanddeere

11-30-2005 09:57:05




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Measuring resistance that low with a standard hand held ohm meter can be subject to error. If there was 4.0 amps and .1 ohm reistance on just one line alone that's just about to make starting misorable. If .4V drop on one line and likely .4V drop on the other. There is a loss of .8V on a system with about 5.0V to 5.5V or 16% voltage drop. There has to be a high resistance connection,wire or switch in there somewhere making trouble. VD is best found by measuring the voltage across a set of switch terminals, from end to end on a cable etc. Try the voltage from the (-) battery post to the coils (-) post at rest and when cranking. Then again but from the battery's (+) post to the coil's (+) post. And of course post to post on the coil. There is VD in there somewhere. Of course with two extra volts with the 8V battery, a drop of 2-3 volts will go unnoticed until the system deteriates further.

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