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#1 |
Registered User
Join Date: Jan 2001
Location: Russellville, Tn and DeLand Fl.
Posts: 533
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Was lucky enough to buy a 71 gmc w/ a tach dash, but it does not work. I have the original wiring harness and is connected correctly. 12v to the tach and other side to the negative side of the coil. Any ideas??????
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#2 |
67-72 Addict!
Join Date: Feb 2002
Location: The TAX State!
Posts: 7,857
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Look for breaks in the circuit panel. Just a thought.
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Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads |
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#3 |
Project Junkie! Fishing Poor!!
![]() Join Date: Dec 1999
Location: Olympia,Wa. 98512
Posts: 10,770
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The tach could be broken and need replaced. We have new ones if interested. WES www.ClassicHeartbeat.com
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On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys |
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#4 |
Senior Member
Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
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I would make sure the dash is grounded, 12 volts are at the tach itself, and check the wire to the coil for continuity. Tachs can go bad, but my experience has been good with the tachs, no failures out of the (7) originals that we have and most of them we have had for over (8) years.
Since the tach hooks up directly, the printed circuit would not have anything to do with the tach. We hook our tachs to the "unfused" ignition terminal on the fuse panel. Jim |
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#5 |
Registered User
Join Date: Jan 2001
Location: Russellville, Tn and DeLand Fl.
Posts: 533
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Thanks everyone, I haven't given up yet
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#6 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Even if the inst panel has a good ground, i would try to ground the tach its self too. Can't hurt if the other wires are all good.
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