8 replies to this topic

[rids]

I'm putting a new engine in a mini and it has an electronic dizzy with two wires coming out instead of 1, a white one and a white one with black stripe does anyone know how to wire this and do i need a different coil? 

[CityEPete]

The white needs to go to a positive feed, + on the coil will be best, white with the black stripe is a straight swap for the standard one so either join it near the dizzy or if its easier take it straight to the - on the coil (-cb). You will need to be using a 12v coil to do it that way with no ballast wire or the 12v feed to the ignition kit will need to come from elsewhere, -cb to the same either way.

[rids]

cheers.  nice and straight forward

[CityEPete]

No problem, if you have an extra white cable on the + coil thats your rev counter leave it there so you might have ignition feed in, positive feed to you elec ignition module and the rev counter trigger all on the + terminal. Just the black with white tracer to - or cb depending on the coil marking.

[dklawson]

No problem, if you have an extra white cable on the + coil thats your rev counter leave it there so you might have ignition feed in, positive feed to you elec ignition module and the rev counter trigger all on the + terminal. Just the black with white tracer to - or cb depending on the coil marking.

 

Not quite.  Tach sense wires connect to coil (-) so they can detect the swing between 0V and 12V.  A second white wire on coil (+) would be a 12V supply for another component, typically something like an electric fuel pump.

[CityEPete]

I havent got one on mine, I added that from information from a different thread, makes more sense that way, looking at the wiring diagram it actually isnt white either as I have seen on here quite a few times, its the same as the cable to the points black with a white trace?

[dklawson]

I can only confirm Lucas wiring through probably the late 1970s.  The wire between the distributor and coil was typically white/black.  White/black was also the color of the tach sense wire used on RVC type Smiths tachs.  Earlier RVI tachs are wired very differently (in series with coil power) which I won't get into here.  White wires were typically run to the coil (+) terminal for 'standard' ignition systems.  Ballast ignitions had a white/pink (pinkish) wire to coil (+) along with a wire between the starter solenoid and coil (+).  

 

In common Lucas wiring schemes, white wires are un-fused, switched 12V.

[CityEPete]

Thanks.

The Haynes diagrams are terrible mainly concerning the items numbered as the wrong components!

[dklawson]

Later wiring diagrams are sometimes difficult.  The early diagrams which look like they were hand drawn are not that hard to trace and follow.  Though there are some later Range Rover and Jags over here, cars like the Mini stopped being imported to the U.S.  around 1970 and MGs/Triumphs only made it about another 10 years.  That means I seldom have to look at "modern" wiring diagrams for anything newer than 1980.