MGB & GT Forum
Tach not Working - 73 GT
It's powered by the green circuit. If that fuse is blown, you'd also have no turn signals, temp and fuel gauges.
It's triggered by a white with black connector at the coil. Check to see if it hasn't been knocked off. Does the light in the gauge come on with your headlamps? Might be a bad ground.
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1970 MGB Black Label OD, APT VP12, Fidanza Flywheel, Flowspeed Head, Hilton AUD405 HS4 SU's, Schlemmerized Distributor, Pertronix Ignition, Saturn Alternator, 15" Dayton Wire Wheels, Falken ZE 912's, Falcon Big Bore
1972 MGB GT Blue Label OD, APT VP14, Fidanza Flywheel, Flowspeed Head, HIF SU's, Schlemmerized Distributor, Points Ignition, Saturn Alternator, 15" GC360 Wheels, Falken ZE-950s, Peco Exhaust, Frontline Costello front valance
It's triggered by a white with black connector at the coil. Check to see if it hasn't been knocked off. Does the light in the gauge come on with your headlamps? Might be a bad ground.
__________________________
1970 MGB Black Label OD, APT VP12, Fidanza Flywheel, Flowspeed Head, Hilton AUD405 HS4 SU's, Schlemmerized Distributor, Pertronix Ignition, Saturn Alternator, 15" Dayton Wire Wheels, Falken ZE 912's, Falcon Big Bore
1972 MGB GT Blue Label OD, APT VP14, Fidanza Flywheel, Flowspeed Head, HIF SU's, Schlemmerized Distributor, Points Ignition, Saturn Alternator, 15" GC360 Wheels, Falken ZE-950s, Peco Exhaust, Frontline Costello front valance
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Sep 17, 2014 08:17 PM
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 Joined 18 years ago
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dash light for tach has zilch to do with signal.
Check continuity for the white/black wire from tach to coil (i.e. check ohms. Should be zero or near).
Reassembling my car after painting I found I'd "lost" the tach end of the white/black wire so ran a new one (white wire with Sharpy black line drawn on it, on both sides<G>
works fine.
1973 Pale Primrose Roadster. A nice 10-footer!
SUs, Datsun 5-speed
Check continuity for the white/black wire from tach to coil (i.e. check ohms. Should be zero or near).
Reassembling my car after painting I found I'd "lost" the tach end of the white/black wire so ran a new one (white wire with Sharpy black line drawn on it, on both sides<G>
works fine.1973 Pale Primrose Roadster. A nice 10-footer!
SUs, Datsun 5-speed
Pics of my tach ( car built 12/72 )
Attachments:
IMG_5279.JPG 25.2 KB
 Geelong Victoria, Australia
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Sep 27, 2014 02:29 PM
Top Contributor
 Joined 13 years ago
15,855 Posts
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