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Re: How would I test that ???? Posted by SWEDECAR [Email] ![]() ![]() ![]() In Reply to: How would I test that ????, Mark V. Wessner, Tue, 14 Sep 2010 11:36:42 Members do not see ads below this line. - Help Keep This Site Online - Signup |
First you check to see if any area close to starter lug nut or alternator lug nut looks burned or overheated in general. Then you check at battery terminal if you see any corrosion and maybe peel off the insulation if you find corrosion to see if the strands in cable is affected.
If you see corrosion has moved into the strands in pos or neg cable, it is affected in some ways.
The next is to do a voltage drop test of the circuit but for that you need to be able to load up the circuit (as in cranking over) while at the same time measure with a volt meter between alternator lug nut and positive battery terminal.
It should be fairly un affected if the circuit is healthy showing close to 0 Volt and if it is up at 0.5 volt or more, something is going on.
The Volvo's I see all the time with bad crimped pos battery cable terminal show about 200 to 400 mV under load and those are so hot to the touch that it will burn the skin instantly if you put your hand on it.
Anders
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