Dear list,
Armed with a couple of articles about "Ignition System Trouble Shooting"
I started measuring yesterday evening.
As a result of these measurements I've got 2 questions:
- Where can I find the second terminal of the secondary winding? One
terminal of the secondray winding is connected to the high tension lead
which goes to the distributor. Is the "ground" side of the secondary
winding the outside of the coil? (If that's the case, this might be my
problem. I measure infinite resistance between the high tension output
and the outside of the coil. Which could indicate that my secondary
winding is broken)
My second question has got to do with Les Bengtson's article: http://www.
custompistols.com/cars/articles/ignition.htm. In this article he writes
at some point: "The next test is to use the volt meter to read the voltage
coming from the coil with the ignition switch on. This should be between 6
and 9 volts, depending on model of coil. If it more than this, the coil is
shorted internally"
- Unfortunatly I can't find the "preconditions" for this test. Should I
disconnect the CB (Contact Breaker) cable? Should the points be open or
closed?
- The voltage on the "input" terminal of the primary winding is approx.
12V in case I switch ignition on. (This seems to be correct)
- The voltage on the "output" terminal of the primary winding depends on
the "preconditions" mentioned above.
- If contact breaker closed the voltage is low, almost zero.
- If contact breaker is open or disconnected the voltage is high,
almost 12V.
Compared to the schematics on "http://www.mgbexperience.com/electrical/
htelec_101.html" this seems to be correct but it contradicts with the 6
to 9 Volts mentioned in Les Bengtsons article.
Hope somebody can help...
Specs: '63 MGB, negative ground
Thanks in advance,
Menno Meijer
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