tacho wiring B10M

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bagmaker
Posts: 13
Joined: Fri Jun 26, 2015 10:09 am

tacho wiring B10M

Post by bagmaker »

Hello fellows,
1987 B10M volgren built DD, does anyone know of the tacho wiring system?
There are only 3 pins on the gauge itself, "+" "-" and "w"
The pulse is generated by a magnetic style switch on an engine gear.
It worked OK before my wiring "modifications" but shows nothing at present with the "w" connected directly to one of the switch terminals

Does the tacho need a 24v pulse feedback from this switch or does it earth through the switch (sender) like a normal level / temperature gauge?

Cheers for any help
LB608
Posts: 1106
Joined: Sat Mar 06, 2004 8:56 pm
Location: New Zealand

Re: tacho wiring B10M

Post by LB608 »

if it ain't broken don't fix it.
bagmaker
Posts: 13
Joined: Fri Jun 26, 2015 10:09 am

Re: tacho wiring B10M

Post by bagmaker »

LB608 wrote:if it ain't broken don't fix it.
duh, its now broke.
Helpful, thanks so much
robhindmarsh

Re: tacho wiring B10M

Post by robhindmarsh »

I have a copy of the Workshop Manual and it does have a section on how to test it. Will that help.
bagmaker
Posts: 13
Joined: Fri Jun 26, 2015 10:09 am

Re: tacho wiring B10M

Post by bagmaker »

Thanks Rob,
I figured it out but forgot to update this post. For lurkers in the future, the tacho sender polarity is critical, wire on the wrong side gets you nothing.
I dont suppose that manual is in electronic form??
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