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Tractor Talk Discussion Forum

Electronic tachs

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MF-50

01-16-2004 15:06:42




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Has anyone got experience with electric tachs on alternator conversions? If so,where is the best place to hook up the power? Thanks.




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Mark

01-17-2004 17:37:13




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 Re: Electronic tachs in reply to MF-50, 01-16-2004 15:06:42  
To use an electric tach, you must use an alternator with a tachometer terminal. I don't think the single wire delcos are available with this option.You would have to go to an internally regulated delco with 3 terminals on the case(battery,exciter and tach). Plus you will have to adjust your pulley size accordingly to give you a correct reading.



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Bob

01-17-2004 20:40:55




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 Re: Re: Electronic tachs in reply to Mark, 01-17-2004 17:37:13  
The tach terminal on a Delco alternator is just a connection made to one of the 3 stator leads and brought outside the alternator, where you can connect a tach to it.

This connection can be the OEM little terminal stud, or just a wire hanging out of the alternator. Either way will work just fine.

If you have a 1-wire Delco alternator without a tach terminal, you can go to an alternator shop and get the little insulated stud and connector, and install it in the hole that already exists in the rear endbell, or just open up the alternator and connect a length of wire to one of the 3 studs on the rectifier assembly, and bring it out the back of the case. A dab of silcon rubber will keep the wire from chafing, and shorting out where it exits the alternator. A connection to any one of the 3 stator lead studs will work.

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MF-50

01-18-2004 03:51:19




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 Re: Re: Re: Electronic tachs in reply to Bob, 01-17-2004 20:40:55  
Thanks for your responses.My alternator is a one wire and has a small stud under the main wire.Is this for tachs?If so,then would the other tach wire hook up to the negative side of the coil?



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