Alternaters

[stamfordian]

I have to conect the alternater up on the boat its a standard 75 amp job off a transit looks like Lucas.The three pin conection is no problem 2common for power to battery and 1 warning .However i need to conect it to the tacho ,theres a spade post marked w and a post marked b or 8 not clear ,anybody know which to connect to the tacho???

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[tr7v8]

w will be the tacho connection, normally a link to one of the field windings.

Dunno what b or 8 could be, how old is it?

Jim
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[mtb]

cant you connect an avo to see which terminal gives an increase when the rev's are opened up. I know one is for the suppresser ,I'l try find the book which will have the info .
Cheers
Mick

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[stamfordian]

Thanks for the replies had to dash....crimbo shopping urghhhhh

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[tr7v8]

Mick,

it won't increase in voltage the Tacho measures frequency eg. rotational speed in this case of the alternator. Hence the direct feed from one of the windings.

JIm
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[J_Priedkalns]

The W connection is your tachometer terminal. Most tachometers have an internal calibration adjustment trimpot to compensate for various pulley sizes to match your engine RPM's.

 

[brianrunyard]

The one marked 'B' is the battery sensing connection.

Brian
http://homepage.ntlworld.com/brunyard