nuckollsr(at)cox.net
Guest
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 Posted: Sun Nov 19, 2006 6:47 pm Post subject: Magneto system checks with ohmmeter |
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At 01:28 AM 11/20/2006 +0000, you wrote:
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<bobbyhester(at)charter.net>
--- In OhioValleyRVators(at)yahoogroups.com, Bobby Hester
<bobbyhester(at)...> wrote:
Below is what I used to wire my key switch to work with my ignition
setup. I have one mag LH and one Lightspeed Ignition RH. Today I checked
my mag to insure it was grounding properly. What I found out and you'll
read about below is this. If you check the mag lead wire while it is
disconnected from the mag you will see that when the key is off and when
it is turned to right, the lead is grounded. But the kicker here is that
when you connect the lead to the mag and then check the stud on the mag
this is what you will find. Key off mag is grounded, key turned to right
mag is grounded, key turned to left the mag is still grounded. You wound
think that it should not be, so that will make you think that it is not
going to work, but do an engine run up and then a mag check and you will
find that everthing works like it should. As far as timing the mag and
timing the LSI I just followed the directions for each one.
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An ordinary ohmmeter will not generally show whether
a mag switch is closed or not while still connected to
the mag. The mag switch is connected in parallel with
the magneto's primary winding which is also in parallel
with the points. With the points closed, the p-lead is
definitely grounded. With the points open the DC resistance
of the primary winding is so low that most ohmmeters
won't reliably indicate it.
This is why the magneto "timing box" is an ac current
generating device that readily detects the point opening
during a timing operation were a dc ohmmeter is not useful.
Bob . . .
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