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BTW, I also tried measuring the resistance between the center of the rotor and the tab on the outside edge.... and get no reading no matter what scale I use.
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> type3-vwtype3.org <type3-vwtype3.org-bounces@lists.vwtype3.org> on behalf of john carartbyjohn.com <john@carartbyjohn.com><br>
<b>Sent:</b> Monday, June 20, 2022 8:36:36 PM<br>
<b>To:</b> type3@vwtype3.org <type3@vwtype3.org><br>
<b>Subject:</b> Re: [T3] How's the trip going?</font>
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<div class="PlainText">Thanks for the info tonight Jim. Still trying to track down a new rotor.<br>
<br>
I pulled the old rotor. Shouldn't there be continuity between the center and the tab that swipes by the 4 plug wire locations in the cap? I don't get and reading there at all.<br>
<br>
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________________________________<br>
From: type3-vwtype3.org <type3-vwtype3.org-bounces@lists.vwtype3.org> on behalf of Jim Adney <jadney@vwtype3.org><br>
Sent: Monday, June 20, 2022 8:03:37 PM<br>
To: type3@vwtype3.org <type3@vwtype3.org><br>
Subject: Re: [T3] How's the trip going?<br>
<br>
John,<br>
<br>
Nice to get that call from you tonight. I'm 99% sure that the rotor is the<br>
problem.<br>
<br>
My favorite tool for diagnosing HV spark problems is an inductive timing<br>
light. The inductive pickup senses CURRENT, so, in this case, you'd see<br>
current going into the distributor but not coming out.<br>
<br>
Since that current is bound and determined to get to ground somehow, it has<br>
managed to get there somewhere within the distributor. There are only 2 HV<br>
insulators in the distributor: the cap and the rotor.<br>
<br>
The cap is easy to inspect. Sparking to ground in the cap will either be via a<br>
carbon track, which is easy to see, or by way of dew (yes, been burned by<br>
that!) inside the cap.<br>
<br>
The spark can also puncture right thru the rotor, to the grounded shaft. This<br>
is made more likely by the OG sharp corners on top of the shaft. I file a<br>
radius on these whenever I rebuild a dizzy. You won't be able to see the<br>
puncture. It's completely invisible, but you can find it with a HV source that<br>
sparks along the insulator surface. If there's a puncture, the spark will go<br>
RIGHT THERE. If there's no puncture, the spark will flow evenly along the<br>
whole surface.<br>
<br>
I've encountered this twice. Once on a customer who was stranded<br>
somewhere. Couldn't figure that out until I swapped him the rotor from my<br>
Square. I'll tell you the rest of that story when we see you on Thursday.<br>
<br>
It happened to me on my ugly/rusty '73 a few years ago. That car had<br>
become hard to start and would sometimes have trouble pulling away from<br>
stoplights. It was oddly intermittent. Unfortunately, it never happened when I<br>
was home, near tools. That was an aftermarket rotor, now in the<br>
basement,marked bad. Out of curiosity I took it to campus and ran one of<br>
those hand held Tesla coils over it. The spark went right to a place where<br>
the corners on the top of the shaft would have been.<br>
<br>
Good luck on the rest of your journey. See you Thursday.<br>
<br>
--<br>
*******************************<br>
Jim Adney, jadney@vwtype3.org<br>
Madison, Wisconsin, USA<br>
*******************************<br>
<br>
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