200tdi in a series rev counter wire

[moony123]

evening all could do with finding out where i should connect to on the alternator so i can have a rev reading,ive been told its on the 'W' on the alternator accept mine doesnt have a'W'

[ejparrott]

W is indeed the rev counter terminal. What alternator is it?

[Gremlin]

I read somewhere that you can tap of the diode pack, but i am no expert, so someone else can chime in. I leave the electrical bits to the electrical people, i only go far as wiring.

G

[David Sparkes]

You either buy an alternator with a W terminal, create one on the alternator you have, or have someone else do it for you.

W stands for Winding, actually one of the three windings that form the stator (the fixed or stationary winding in the case of the alternator).

It varies from make to make, but basically you take the cover off the alternator, and look for three single wires coming from the stator to the diode pack. Pick any one of those wires and solder a new wire to the point where the existing wire joins the diode pack. The new wire leads to your W terminal, terminate it on a 2BA or 5mm bolt which becomes your W terminal. Make sure the bolt or the internal wire doesn't touch the alternator case, or get trapped, when the cover is replaced. Typically you put the bolt through the plastic cover.

You can of course use any method of connecting your new wire to the wiring loom leading to the tachometer. One single 'chocolate block' screw terminal, or a male / female lucar, whatever takes your fancy.

HTH