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Jumping Tach

Subject: Jumping Tach
Date: Wed, 13 Feb 2002 19:04:09 EST
I have had this problem also. It usually occurs at low idle with the turn 
signals flashing. I traced mind to an underperforming alternator and an 
undercharged battery. Once I put a new battery and alternator in it stopped 
and has never come back. I have no idea why this made a difference but it 

Btw, I have a Crane electronic ignition and Crane fireball coil. 77 B with a 
freshly rebuilt 68 or 69 engine with flat top pistons. Weber DGV and Peco 


Date: Wed, 13 Feb 2002 15:04:56 +0000
From: "Dereck C" <>
Subject: tach and hesitation

I know I have seen this thread before but I never really paid too much 
attention to it.  Oh how I miss those archives :(

Why would my tach drop to zero and bounce around when cold or idling?  Would 
this also be related to hesitation and near stalling on take off in 1st?

70 B

Date: Wed, 13 Feb 2002 15:36:06 -0000
From: <>
Subject: Re: tach and hesitation

Classic (!) symptom of an intermittent connection in the ignition LT
circuit, a break in this circuit will affect both running and the tach.

Check the connections in the white - tach - white - coil - white/black -
distributor circuit, paying particular attention to the flexible wires
inside the distributor.  When accelerating in any gear the change in vacuum
causes the points plate to twist, which flexes these wires, and eventually
they can break either at the terminations or inside the insulation.

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