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d e a d
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Some J-Box problems can prevent starting. Next time it doesn't start, just bash the J-Box a bit, see if that does it. Fiddling with the fuses may have accomplished the same thing.
There may be dodgy solder connections or relays that need to be replaced.
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d e a d
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Clean the fuse contacts.
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Dirty contacts in the starter button?
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Also, check the tension of the contact tabs in the fuse holders. I had one of the fuse holder tabs (contacts) get loose and it melted my J-box. When I repaired it, I squeezed them all so they would grip the fuse tabs and the soldered tabs on the circuit board real tight. I'll try to attach a pic of the damage.
pic below (I hope):
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d e a d
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Same problem for me was loose battery cable bolts... Simple, but it made me crazy, being so intermittent in nature.
hth
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d e a d
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J-Box diagnosis blurb:
http://web.ncf.ca/ag136/jBoxDiagnosis.htm
How the J-Box works:
http://web.ncf.ca/ag136/howJBoxWorks.htm