Allis electric 2500 MPH-RPM tach
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Category: Allis Chalmers
Forum Name: Farm Equipment
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URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=17234
Printed Date: 06 Feb 2025 at 11:00am
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Topic: Allis electric 2500 MPH-RPM tach
Posted By: Allis Fields
Subject: Allis electric 2500 MPH-RPM tach
Date Posted: 26 Aug 2010 at 7:46pm
| 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? |
Replies:
Posted By: norm [ind]
Date Posted: 26 Aug 2010 at 7:53pm
| has to be late combine as the early ones were mechenical |
Posted By: CJohnS MI
Date Posted: 26 Aug 2010 at 8:03pm
pos to the dist side of coil neg to chassis ground 3rd term for lamp just my best guess |
Allis Fields wrote:Posted By: LouSWPA
Date Posted: 26 Aug 2010 at 9:10pm
|
Watchya' figurin on doing 2500 MPH on? ------------- I am still confident of this; I will see the goodness of the Lord in the land of the living. Wait for the Lord; be strong and take heart and wait for the Lord. Ps 27 |
Posted By: bigfish_Oh
Date Posted: 26 Aug 2010 at 11:45pm
|
Lou, everybody knows Allis did do projects for NASA
------------- 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 2014 HD Tri Glide 2009 GMC CC SLT Dually |
Posted By: Bee
Date Posted: 27 Aug 2010 at 1:17am
|
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.
------------- Bob, North Carolina 1949 B |
Posted By: BobH
Date Posted: 27 Aug 2010 at 6:59am
| Would early mech.tachs work on a D17? |
Posted By: Allis Fields
Date Posted: 27 Aug 2010 at 7:42am
| can't post any pics yet computer at home still down. there is a light that has a wire going to the positive post. |
Posted By: gcalent
Date Posted: 27 Aug 2010 at 8:00am
|
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. ------------- Pullin With AC |
Posted By: CJohnS MI
Date Posted: 27 Aug 2010 at 10:56am
me spewed coffee reading that! |
Posted By: Steve in NJ
Date 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
mailto:Steve@B&B - Steve@B&B
|
Posted By: cbt1124
Date Posted: 10 Sep 2010 at 1:47am
| 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. |
Posted By: Coke-in-MN
Date 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 ------------- 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." |