converted tach [to espisicapailian ]

[twincamman]

oy --I converted my car to neg ground so I converted the tach also ----now I cant get the tach to run ---it did at one point but I removed it to tidy up the wiring --[ Now silly old buggar that I am ] ---cannot remember the wiring I used -----key to pos on the coil ---neg on the coil and up through the loop and down to the spade connector to the distributor and fused to the power spade on the tach -----------now it blows fuses and won't allow the car to start when the tach is hooked up but will start with the tach undone ----a little help here from any Marconi or ohms type please -- --ed

[wojeepster]

I think you should have three wires. Power, Ground, and Signal Hope this helps Signal connected to - side of coil and pwr, gnd self explanitory.

[twincamman]

ok ---I have power to the tac from a fused source and ground from the case ----but where do the two leads from the external induction loop go ????ed

[paddy]

Is it an RVI or RVC tach?

Paddy

[twincamman]

this determined how??? there is one jeweled light for ignition --ed

[paddy]

They usually say either RVI or RVC on the face of the dial in small white writing.

If that's not there, what colour wires are coming from it?

Paddy

[twincamman]

RVI2401\001-----I had to get the BIG magnifying glass to find it ----ed ----

[paddy]

The two wires from the induction coil go in series with the main power supply to the coil; not in the path from the coil to the points.

So one connects to the +ve supply from the ignition, the other to the coil +ve. Coil -ve goes to the points.

Paddy

[elansprint71]

Connect the black wire to your Shapecraft alluminium hard-top; you will have no further problems.

26/R wiring is the very work of the devil, so I've read.

[twincamman]

ok thanks ---I'm almost out of soldier and wire and connectors ----this must be the only combination I haven't thought of ----it is indeed evil -- --ed

[memini55]

Ed
If the tach was a positive grd unit then you have to make a change to the inside of the tach.
I have done a few of these and found a site on the web which was a discussion on a sunbeam tiger converstion which was a great help. I will look to see if I can find it for you and post back later.

Mark

[memini55]

I had it saved as a favorite and it was easy to find.
http://www.classictiger.com/techtips/motach.html

I hope this will help the fix the problem.

Good luck
Mark

[twincamman]

well Paddy you were close ----you tipped me off with your reply -------having converted the tach to neg ground I had to place the red lead on the neg coil and run the black one to the counter spade on the instrument ----all---- is well next I will convert the speedo to Luthersm or perhaps methodism [where NOBODY has a good time ---thanks ---ed

[neilsjuke]

If you are using a dynamo you will need to change the polarisation of the field windings by holding a supply to the small f terminal of the dymamo for a second you will get a small blue flash , now you are neg earth the neg from the coil goes to the dist .
Neil

[twincamman]

using a denso alt ---ed