Alternator terminals +B and W and there uses.

Right! Had it on the road for all of about a day and already not happy with
it being standard! I've had to fit an alternator off something like a Metro
as the original 16ARC (or what ever it was) packed up. The plus side is it's
a 55A jobby and has two terminals on the back marked +B and W.. as far as I
can remember. Now then, aren't at least one of these for a rev counter?
Unfortunately the alternator did have a multi-rib belt pulley, so had to
swap this for the V belt pulley which I had to bore out as it had a smaller
diameter hole for the shaft! Oh and the tensioner lug was on the wrong side,
could have rotated the front end of the alienator but decided it was easier
just to make a new tensioner, its now easier to get to anyway.
Its a fair point that it took some fitting but it does work a treat!
The question is. what sort of output do you get from these other terminals?
Is it analogue or digital? Are there any rev counters I can connect straight
up to them? Obviously calibration is going to be defiantly out. especially
as I've changed the pulley. Otherewise I'll be looking to make something up.
Thanks! Toby

In article <[email protected]>, TVS wrote:
>
> The question is. what sort of output do you get from these other terminals?
> Is it analogue or digital? Are there any rev counters I can connect straight
> up to them? Obviously calibration is going to be defiantly out. especially
> as I've changed the pulley. Otherewise I'll be looking to make something up.
> Thanks! Toby
>

The people at Low tension do one intended for Landrovers. It takes it's signal
from the W terminal I think. I bought one some time ago but have just not got
around to fitting it, it's a nice bit of kit, VDO gauge ISTR. In fact it's
been a while since I saw it, I bet it's been 'tidied up' by the missus!

You can find more info at:

http://www.lowtension.com/landrover.htm

It's also got a pot to twiddle to calibrate it for diesel fitment.

HTH.

--
simon at sbarr dot demon dot co dot uk
Simon Barr.
'97 110 300Tdi.

On or around Mon, 29 Nov 2004 22:22:00 -0000, "TVS"
<[email protected]> enlightened us thusly:

>The question is. what sort of output do you get from these other terminals?
>Is it analogue or digital? Are there any rev counters I can connect straight
>up to them? Obviously calibration is going to be defiantly out. especially
>as I've changed the pulley. Otherewise I'll be looking to make something up.

B+ I think is normally the warning light terminal, which may be duplicated
in a multi-plug if you have one of those. W is sometimes used for rev
counters, and this produces a non-rectified AC output, AFAIK.

On a petrol vehicle, I'd fit a rev counter which runs off the ignition,
though, more accurate.

If the pulley is something near the same size as the original, you should be
able to get a rev counter to work sensibly. It might be that some of them
are adjustable - you can calibrate it by finding a spark-ignition motor with
a rev counter, hooking a timing light onto it, and shining that at your
diesel crank pulley - run the petrol one at e.g. 1500 rpm, then m,atch the
diesel engine speed so that a mark on the pulley appears stationary. It'll
also appear stationary at 3000 rpm, of course, but I trust you can hear the
difference between 1500 and 3000.