Re: Slow cranker

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Posted by Tony on February 05, 2018 at 10:59:58 [URL] [DELETE] :

In Reply to: Slow cranker posted by Tom on February 04, 2018 at 18:56:58:

Have you actually tested the battery? I assume all cables are secured bright metal to bright metal

Specific gravity to start.

Put a charger on the battery and note charging voltage. Fifteen volts indicates a partially sulphated or sulphated battery. Replace it.

If you don't have a load tester capable of loading to 200 amps, no worries, do an individual cell test with a volt meter and follow it with a cell voltage drop test under load. Perform with a fully charged battery. Static, all cells 2.0,-2.3V no exceptions.

Pull a couple of the plugs and turn on the lights for the load test. Wing it over One cell below 1.75-8V under load, replace the battery.

Sometimes a battery will test OK under a quicky full load test, but lose umphhhh! after the first or second rotation of the engine. Bad cell. An individual cell test will identify which cell is bad.

If the battery passes, have the starter tested. You can bench test all but the armature, unless of course you have a growler.


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