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Allis Fields 
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Joined: 17 Sep 2009
Location: Reedsburg,Wisc.
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 Topic: Allis electric 2500 MPH-RPM tach
Posted: 26 Aug 2010 at 7:46pm |
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I bought a new nos allis tach there is 3 wire post hook ups on the back pos,nec and above them a 3rd post. I want to mount it on my pulling wd with a 1 wire alt. think this is for a combine. Any ideas?
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norm [ind]
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Joined: 16 Sep 2009
Location: BOURBON,IN.
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Posted: 26 Aug 2010 at 7:53pm |
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has to be late combine as the early ones were mechenical
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CJohnS MI
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Posted: 26 Aug 2010 at 8:03pm |
 Allis Fields wrote:
I bought a new nos allis tach there is 3 wire post hook ups on the back pos,nec and above them a 3rd post. I want to mount it on my pulling wd with a 1 wire alt. think this is for a combine. Any ideas? |
pos to the dist side of coil neg to chassis ground 3rd term for lamp just my best guess
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LouSWPA
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Joined: 11 Sep 2009
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Posted: 26 Aug 2010 at 9:10pm |
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Watchya' figurin on doing 2500 MPH on?
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I am still confident of this;
I will see the goodness of the Lord in the land of the living.
Wait for the Lord;
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bigfish_Oh
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Posted: 26 Aug 2010 at 11:45pm |
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Lou, everybody knows Allis did do projects for NASA
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1941 WC sat for 29 years,started & dynoed 27 h.p.
1957 WD45 Grandpa bought new,factory p.s.,added wfe
1951 WD, factory p.s.
1960 D14 HnMk IV BkHoe 4 sale
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Bee
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Posted: 27 Aug 2010 at 1:17am |
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My engine analyzer tach has three wires. Pos to positive side of the battery, Neg to ground, third wire to lug on side of distributor.
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Bob, North Carolina
1949 B
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BobH
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Posted: 27 Aug 2010 at 6:59am |
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Would early mech.tachs work on a D17?
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Allis Fields
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Posted: 27 Aug 2010 at 7:42am |
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can't post any pics yet computer at home still down. there is a light that has a wire going to the positive post.
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gcalent
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Posted: 27 Aug 2010 at 8:00am |
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If it is for a late modle combine, it was made to work off of a sensor in the flywheel housing and counted notches in same. If this what you have it will not work on the inpulses from a distributor, also you need a tach that is able to calabrated for a four cylinder if you use one to the distributor. Most after market ones have seperate wires for 4,6,and 8 cylinder depending what you are going to install it on.
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Pullin With AC
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CJohnS MI
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Posted: 27 Aug 2010 at 10:56am |
LouSWPA wrote:
Watchya' figurin on doing 2500 MPH on? |
me spewed coffee reading that!
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Steve in NJ
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Posted: 27 Aug 2010 at 1:26pm |
Most 3 wire tachs usually have a green black & red wire. (not sure on an AC tach) Shouldn't matter what Alternator you have....
Green- trigger = to coil neg. side. (with Neg. ground)
Black- ground
Red- 12V Ignition source
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cbt1124
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Posted: 10 Sep 2010 at 1:47am |
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I think that the tach you are describing actually was wired into the alternator not the ignition. .If you have a single wire alternator you can just throw that Tach away.
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Coke-in-MN
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Posted: 10 Sep 2010 at 3:23am |
Altenator on my 715B has another terminal on it for the tac. The regulator modual has 3 terminals on it.
Body is a 10SI but has this modification
Edited by Coke-in-MN - 10 Sep 2010 at 3:24am
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Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."
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