71 XJ6 tachometer not working
#1
71 XJ6 tachometer not working
Hi everyone:
the tachometer is inoperative, and has been since we purchased the car (35k original miles).
The needle is pegged all the way to the right (redline), I do not know if this means anything. All the other gauges are working.
Any assistance would be appreciated, and thanks in advance!
Paul
the tachometer is inoperative, and has been since we purchased the car (35k original miles).
The needle is pegged all the way to the right (redline), I do not know if this means anything. All the other gauges are working.
Any assistance would be appreciated, and thanks in advance!
Paul
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Or, a lessor guess.
Most rely on the make and break of the distributor to create a pulse, in turn converted to mechanical movement. Classic electro mechanical technology. As it is the ground leg that is make and break, I would suspect it is grounded all the time, not off and on ground...
Find the ground lead to the - post on the tach. Disconnect it. Fire the engine. If it drops to 0, I got it. If not, Doug's theorem is most likely.
Carl
Most rely on the make and break of the distributor to create a pulse, in turn converted to mechanical movement. Classic electro mechanical technology. As it is the ground leg that is make and break, I would suspect it is grounded all the time, not off and on ground...
Find the ground lead to the - post on the tach. Disconnect it. Fire the engine. If it drops to 0, I got it. If not, Doug's theorem is most likely.
Carl
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