hhornig
Eagle, NE
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Joined: 09/04/2006
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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?
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ScottG
Bothell Wa.
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Joined: 02/25/2005
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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.
Scott, Grace and Wesly
2003 Dodge 3500 4x4, 6 speed Cummins (lightly bombed),
2004 Forest River 25RKS many, many mods.
H0NDA eu2000i
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pulsar
Lewisville, NC
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Moved from Forum Technical Support.
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Works2RV
Summerville, SC, USA
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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.
1987 36' Beaver Marquis High Tech Wide body
3208T CAT, MT643 Allison in a Gillig MHA
Koni's & Toyo all around
FMCA, Good Sam
Jetta TDI
Marsha & Buck
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zmotorsports
Utah
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Joined: 11/29/2007
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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.
2003 Monaco Dynasty/ 26' Haulmark Edge trailer
2011 Jeep Unlimited Rubicon
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slemnah
none
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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.
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zmotorsports
Utah
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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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