The impulses to the tach come from the low tension lead between the coil and
the distributor. That wire actually runs from the coil through a loop at the
tach back to the distributor. The tach takes the fluctuations in the field
created at the loop and converts that to rpms. It is likely that is the
cause of the problem. Either that or the tach is failing. :-) - Jim
-----Original Message-----
From: spridgets-bounces@autox.team.net
[mailto:spridgets-bounces@autox.team.net] On Behalf Of Bill L
Sent: Monday, July 29, 2013 7:53 AM
To: spridgets@autox.team.net
Subject: [Spridgets] Is it a problem?
Hello Spridgets,
Went to the ABFM-Bellevue over the weekend. Car runs great, but...
I was headed home and the tach started to bounce. Not just a little,
but WILD swings. The car never seemed to loose power, but the tach
would fall from 3500 down to 1500 or so then bounce back, drop,
bounce... I slowed down a little and it stabilzed, and didn't bounce
again..
I took it easy and looked for a loose wire on the coil but found
those two to be OK. I did notice a little grove being worn on the
wire from the coil to to the dizzy, where it was rubbing on the body
a little, so I turned the wire so that it didn't rub at that spot.
..
could the tach bounce be caused by electrical leakage in that coil wire?
I put a spare in the trunk. .. I'll put electrical tape over the
wear spot and insulate the body at the wear point.
?????
--
Best regards,
Bill L. mailto:pythias@pacifier.com
'66 Sprite MKIII HAN8L49403 "the red thing"
"It's made the grass wet," said Tom after due consideration.
------------------------
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