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Open Roads Forum  >  Class A Motorhomes

 > Diesel Pusher Tach/Alternator

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hhornig

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Posted: 03/08/12 10:46am Link  |  Print  |  Notify Moderator

I have a 97 Monaco Dynaasty that I just removed from storage. The tachometer and the alternator are not working. According to the schematics there is a wire running from the alternator to the tachometer. Does anyone know if the tachometer runs off the alternator? Any other suggestions?

ScottG

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Posted: 03/08/12 11:30am Link  |  Print  |  Notify Moderator

Yes, that used to be a common way of providing a tach signal for diesels. Sometimes the diodes in the alt. fail while the vehicle is parked.
Replacing or having the alt rebuilt will likely solve both problems.
BTW, if you replace the alt make sure the new one has the "Tach" output - not all of them do.


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pulsar

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Posted: 03/08/12 01:57pm Link  |  Print  |  Notify Moderator

Moved from Forum Technical Support.

Works2RV

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Posted: 03/08/12 02:01pm Link  |  Print  |  Notify Moderator

That is how ours is configured - when the atl started to fail the first indication was the erratic acting tach. - as stated, make sure replacement atl has connection for tach output.


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zmotorsports

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Posted: 03/08/12 02:03pm Link  |  Print  |  Notify Moderator

ScottG wrote:

Yes, that used to be a common way of providing a tach signal for diesels. Sometimes the diodes in the alt. fail while the vehicle is parked.
Replacing or having the alt rebuilt will likely solve both problems.
BTW, if you replace the alt make sure the new one has the "Tach" output - not all of them do.


Exactly. The tach is powered by the alternator. The signal is generated by the stator windings and the pulses feed the tachometer. The number of poles determines how many pulses equals how many RPMs. So therefore if a diode is open the pulses are not being received.

Mike.


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slemnah

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Posted: 03/08/12 05:53pm Link  |  Print  |  Notify Moderator

I just replaced the Leece Neville alternator on my 97 Imperial with a Delco Remy alternator. If you go that route, do not purchase a white box alternator (made in china)- make sure that it is a Delco Remy in a Delco Remy box.

zmotorsports

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Posted: 03/09/12 05:49am Link  |  Print  |  Notify Moderator

slemnah wrote:

I just replaced the Leece Neville alternator on my 97 Imperial with a Delco Remy alternator. If you go that route, do not purchase a white box alternator (made in china)- make sure that it is a Delco Remy in a Delco Remy box.


Can I ask why you went that route? I personally think the Leece Neville is a great alternator. Was it merely price?

Mike.

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