[DeTomaso] Tach Issue ...

[Charles Engles]

Dear Erik,


            It might be possible that you have a bad 8920 tach adapter.  I
once bought a new MSD 6AL from Summit and it was bad right out of the
box.......It is a remedial suggestion, but I am very remedial with
electric/electronics.


                  I hate electrical gremlins,  Chuck Engles




-----Original Message-----
From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] On
Behalf Of Erik Anderson
Sent: Friday, April 16, 2010 10:21 PM
To: De Tomaso List
Subject: [DeTomaso] Tach Issue ...

Good evening, folks.

A few weeks ago, I installed a new alternator - the Delco si12 model.
Because this alternator has an integrated voltage regulator, the wiring from
the alternator to my MSD ignition is a little different.  Working closely
with Jon Haas from Pantera Electronics (what a great guy), I think we have
the wiring figured out ... but the weird thing in all of this is that,
although my cat starts and runs as strong as ever, the tach does not
register a single RPM.

It should be noted that I have a new tach adapter (model 8920) and a new MSD
SS blaster.  The wiring for those components were very easy and, with a
little (ok, a lot!) of assistance from Jon, I think we have the MSD-to-tach
wiring correct as well.  But the tach still won't work.

I have tried almost everything to get it to work: tried a second tach,
rewired the trigger wire from the tach adapter to the tach, re-wired the
grounds, checked power to the tach ... nothing has worked.

So, I ask ... has anyone experienced this before?  Any suggestions?

Fire away, folks ... and, thanks in advance for any ideas you have for me.

Cheers,

EA #3528

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