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Problem with the Harbor Freight Carbon Pile battery tester

 
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Mauledriver(at)nc.rr.com
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PostPosted: Sun Dec 23, 2012 4:26 pm    Post subject: Problem with the Harbor Freight Carbon Pile battery tester Reply with quote

I've used this unit a few times without a problem. Then it suddenly
stopped working. I couldn't seem to apply a load though the exact
symptoms I don't quite remember.

Today, I pulled the unit apart and found
1) a fuse on a small circuit board which had not blown (not easily
replaceable either)
2) the carbon disks that presumably supplies the variable resistance
seem to be stacked between two steel plates but the carbon disks
appeared to be loose or askew.

If I screw the big knob down and shake things a bit, I can get the stack
of carbon plates lined up and it seems that increased resistance results
from placing more pressure on the stack.

Does that sound right?

Furthermore, it would seem for consistent operation, it would be best to
lie the unit on its back to insure the carbon plates remain flat.

Tomorrow I will attempt to use it again to see if it works now that the
plates are back in position.

Any insight or tips welcome. I will report further tomorrow.

Thanks
Bill


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