electric arc ?????


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shermanator
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electric arc ?????

Postby shermanator » Tue Feb 07, 2012 7:40 pm



I have an electric arc jumping from the starter case to the head near exhaust ,anybody got any ideas ? Can somebody point me in the right direction ? Can a bad ground cause this?



bustedwing
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Re: electric arc ?????

Postby bustedwing » Tue Feb 07, 2012 9:24 pm

That sounds more like a cracked insulator on the positive post of the starter.I am assuming you are seeing this arc when engaging the starter, so that is an assumtion on my part.If so, pull the starter and you should be able to see a crack fairly easily.If I have this wrong, send more info and I'll try again.
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shermanator
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Re: electric arc ?????

Postby shermanator » Tue Feb 07, 2012 9:45 pm

thank u bustedwing , if that is the problem would it still be arcing off the starter case back away from the hot wire ? its arcing off the case to the head . Got me stumped

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littlebeaver
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Re: electric arc ?????

Postby littlebeaver » Wed Feb 08, 2012 10:15 am

Wow :shock: :shock: :shock: Yeh I'd remove the neg. cable and remove the starter and inspect it if that stud is touching the case you might get smoke or maybe an arc I don't know but I'd be careful you don't fry your ass... :o like I did...many times :shock: :shock: can't help it i'm stupid..Oh shaking a multimeter don't make it work better..I tried it, nope.. :shock:

bustedwing
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Re: electric arc ?????

Postby bustedwing » Wed Feb 08, 2012 10:40 am

Yes, the positive post has an insulator also the brushes could be shorting against the case, either way the starter has to come out and checked over. You have a definite short inside . Good luck.
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shermanator
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Re: electric arc ?????

Postby shermanator » Wed Feb 08, 2012 6:14 pm

Thanks for the help ,soon as I get a chance gonna **** the starter out and give her a look . thanks again .

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WingAdmin
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Re: electric arc ?????

Postby WingAdmin » Thu Feb 09, 2012 1:14 pm

Is the arc a thin spark (like a spark plug spark) or a thick, bright one?

A thin spark could indicate something going really wrong with coil/spark plug insulation somewhere, although how it could get to arcing between the starter and head, I'm not sure.

I'm thinking it's probably a thicker spark, indicating more amperage at play - and perhaps this is due to some resistance between the starter case (which it uses for ground) and the engine block? Take an ohmmeter and see if you can measure any resistance between the starter case, and both the engine block and the negative battery terminal.

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grandpa
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Re: electric arc ?????

Postby grandpa » Thu Feb 23, 2012 5:44 pm

Hi.
I agree with WingAdmin. To me it is the ground connection between the starter itself and the engine. If there is a short with the brushes or other insulation inside the starter the arc will be there and not between the starter and the engine. So first check the recistance between the starter case and the engine. There should almost be less than zero. And if there is some resistance your starter will also loose power because there will be a voltages drop her.

One more thing wish can cause the arc is a wery dirty oil cover starter ( but I donn't think yours is so ) but again that only happend if the there is resistance between the starter and the engine.

Good luck

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tedmass
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Re: electric arc ?????

Postby tedmass » Fri Feb 24, 2012 4:33 am

Sounds like something in starter. disconnect pos cable from battery and check for continuity from starter case and pos cable if so its in starter


Be carefull out there


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