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Electric shock from dizzy. Constant when running

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Aussie Dubbin Fahrvergnugen

895 posts · joined Jul 2008 ·

#991169
Any ideas? My HT lead from coil to middle of dizzy is giving me a hell of a shock and I can't work out why? Could it be a bad lead or bad lead connection. It's not the leads that go to cylinders just the one.
It's not fun testing it each time too.

Thought maybe a bad earth? Earth for alternator goes back to battery and I piggy backed this to the fuel pump mount?

Cheers
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barls Administrator Causer of Chaos and Mayhem

9,473 posts · joined Jun 2004 ·

#991173
possibly old leads.
its not a good idea to touch them while its running as you have just found out.
“We all pay for life with death, so everything in between should be free.” Bill Hicks
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vlad01 Compulsive Aussie Vee Dubber

4,270 posts · joined Jun 2010 ·

#991174
Isn't that normal for a dizzy with kind of leads VW tend to have on them?

I got shocked every time just about with any car that has a dizzy and therefore I do not touch them when they run, not even if the engine not running and ignition on.🤪 ouch!

the reason you get shocked is, you are being a shorter path to ground for the high voltage. Because the high voltage has to jump the rotor button gap plus the plug gap, resistance in the ignition leads, crappy boot on the center lead wont give enough resistance from it to your hand, so it is taking that path.

If you use copper core leads from dizzy to plugs, that should reduce the incidence of shocks, I would check the resistance of your leads, they might be stuffed and getting shocked easier as a result.😂

I remembered I was fixing a car for my uncles neighbour long time ago, its leads were stuffed and the sparks were jumping from the coil to the block which were about 60mm sparks !! leads read like 15K resistance, new ones were 1.5-3k it was safe to touch after that.

71 notchback,
Past owner of, 70 NB, 73 SB and 72 FB TLE

ACE76 Seriously Crusin Dubber

105 posts · joined Aug 2005 ·

#991178
You can get a shock from the outside of the lead, from induced voltage: no direct contact needed -- anything above 2 or 3000V could do this, depending on distance etc. If you are holding the centre lead to check for spark strength, hold it in the middle with insulated pliers.
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vlad01 Compulsive Aussie Vee Dubber

4,270 posts · joined Jun 2010 ·

#991180
2-3000v?

add another 0 there for conventional coil, double that again for DIS type coil packs.

71 notchback,
Past owner of, 70 NB, 73 SB and 72 FB TLE

mgiles Casual Dubber

34 posts · joined Jan 2014 ·

#991205
ACE76 wrote:If you are holding the centre lead to check for spark strength, hold it in the middle with insulated pliers.
x2 - if checking for spark I use a pair of insultated needle nose vise grips lightly gripping the wire so it wont get damaged.

Cant say I have ever been zapped being in the vicinity of wires though.

AA003 Custom Title Time!

1,189 posts · joined Oct 2011 ·

#991255
I always put my tongue on it to check for voltage.
I read it on samba, so it must be correct.

Sometimes Volkswagen dealers sell spare parts. Amazing isn't it!😂