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Ontario Rodding Community -> Electrical, Lighting, Ignition systems, Charging systems, Heating & Air conditioning -> Checking tach connection on G M HEI
Post Info TOPIC: Checking tach connection on G M HEI
FLEET 51


Portland On Rod-Side Member

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Checking tach connection on G M HEI
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              HI GUYS : I'm running a G.M. HEI in my 250 INLINE but my tach doesn't work -- I don't know anything about that stuff and would appreciate any tips on how to check it out -- Thanks in Advance -- LATER --  DON / FLEET 51 



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henrystoys


Carleton Place On Rod-Side Member

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Don, Hope there is something here. good day

www.nastyz28.com/forum/archive/index.php/t-255488.html

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Carleton Place, ON. 57 B/A wagon, 355/ 700R4,71 Nova 355"SB, 51HenryJ.
www.picturetrail.com/sfx/album/listing/user/henrys57wagon
Slim


Hydraulic Service Dundas On

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the tach signal is fired off the coil negative on the HEI . No idea on what tach you are using but it would have to be compatible to HEI coil

HEI4PinWire01.gif



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FLEET 51


Portland On Rod-Side Member

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HI GUYS : Thanks for the replies -- I will follow through on both of them -- AGAIN , THANKS -- LATER -- DON / FLEET 51

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Lightspeed Mike


http://lightspeedmetaldesign.com/

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Tach wire should plug in right beside the ignition feed wire on the cap.


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oldkoot


Brockville On, Old Autos Star

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First question, did it ever work or did it just stop working??

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FLEET 51


Portland On Rod-Side Member

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HI DON : Never worked from new -- I need to learn how to check out the feed from the " Tach " connection on the cap , then just go step by step -- Thanks -- LATER -- DON ? FLEET 51

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Slim


Hydraulic Service Dundas On

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If the car runs and the wire is good its sending a signal . If you lost the negative  the coil would saturate and stop firing . What tach are you trying to use ?



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henrystoys


Carleton Place On Rod-Side Member

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Don, could you hook up the tach on a friends car to see it is the problem? good day



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Carleton Place, ON. 57 B/A wagon, 355/ 700R4,71 Nova 355"SB, 51HenryJ.
www.picturetrail.com/sfx/album/listing/user/henrys57wagon
FLEET 51


Portland On Rod-Side Member

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Hi SLIM & HENRY : Thanks for the tips -- The car does run and the wire marked " Tach " is properly connected to the Tach lug on the HEI cap . " Old Koot " tudoured me yesterday on how to test for output at the cap -- I will start there . Henry : At this time the tach is installed in the dash , so testing it from another scource would be difficult -- Again , THANKS to all for your input -- LATER -- DON / FLEET 51

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ThatChevyGuy


That Chevy Guy Brantford ON

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You can try and check the other connectors on the tach. IF its aftermarket, there should be a power and a ground to check. I had that trouble the first time I tried to use mine.

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FLEET 51


Portland On Rod-Side Member

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ONCE AGAIN : THANKS guys for the tips -- It's all very helpful and appreciated -- LATER -- DON / FLEET 51

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