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Sesman:
What are the chances of both ht secondaries simultaneously going open circuit. Primaries are might fine showing continuity and 4 ohms.

I’ve tried continuity between ht leads both with caps and plugs installed and bare, exposed innards. iv’e also tied the plugs together and flashed the live/contact beaker wires to a battery to generate a spark…. I get nowt.

Is this a common occurrence or am I missing something?

Any contributions gratefully received.

SteveD CB500K0:
If this is 1/4 or 2/3, then the HT leads are just the two ends of a single winding.

So not an unexpected result.

If it’s 1/3 or 2/4 then I would expect the universe to end before both broke at the same instant (other than though catastrophic impact damage…)


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AshimotoK0:
What resistance range are you on.. you are measuring typically 15,000 Ohms so you need to be on the high resistance range. that's the bare ends with no resistive caps , which would add typically another 5,000 Ohms  for each cap. You also  need a capacitor (condenser) in your test circuit to build up the energy to produce a full spark

Sesman:
Ahh, capacitance.

But should I not have continuity between the plugs/leads?

AshimotoK0:

--- Quote from: Sesman on September 29, 2021, 09:40:08 PM ---Ahh, capacitance.

But should I not have continuity between the plugs/leads?

--- End quote ---

Depends what you mean by continuity .. yes there should be resistance between the two HT leads but you will need to measure on typically the 100k Ohm range . On lowere ranges the resistance may not rregister and appear to have no continuity. It's very rare for secondary coils  to go open circuit BUT very common for HT leads to fatigue where they exit the coil body hence giving an open circuit reading. Hope this helps.

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