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hdj81 Tachometer issues and where to begin troubleshooting.

veiloctane

New Member
Joined
May 11, 2014
Messages
7
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canada
Hi guys,
I have a issue here with my 1991 HDJ81 with the Tachometer.
all was fine and normal until just a couple of days ago.

here is a description of the issues that I am having.

when the transmission is in drive the Tach reads 0rpm While driving at any speed the tach immediately jumps to 3000rpm

When in Park the Tach reads 2000-2200rpm
when in neutral Tach reads 2000-2200rpm
gears D,3,2,L read 0rpm and jumps to 3000rpm as soon as I touch the pedal.


what would cause this and how to start troubleshooting?
 
Wiring plug (Square or Oval) on the rear of the alternator?

regards

Dave
 
More often than not this is where the problem lies, ask someone to watch tacho as yiu (carefully) reach in and move the connector about, see if it has any affect on tacho reading. This has also caused more than one alternator to be incorrectly replaced.

regards

Dave
 
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