'93 Disco v8i dizzy leads sequence

**Frontier1** · 25th March 2008, 04:46 PM

Hi All,

Got myself a good deal on a new dizzy cap today. Repco and Supercheap had both quoted me $100 plus for a aftermarket replacement but I went into Bursons and they has a Bosch GL924 for only $42!!

Anyway, in my mad hurry to put it on, I think I screwed up the lead sequence. I did a search on the forum and found the v8plugleads.pdf file that Ladas posted (followed that), but the thing still wont start. In desperation I have re-installed the original cap but still nothing.

I also took out plug 1 and turned the motor over until I was at what I thought was TDC (top of the stroke) and then checked to see if the rotor arm was pointing to lead 1 on the dizzy cap which it appeared to be.

God, all I did was change a cap...what did I miss?

Cheers, Pete'

**Scouse** · 25th March 2008, 06:18 PM

Are you sure #1 was on the compression stroke?
You could well be out 180 degrees on your leads if it wasn't.

**Frontier1** · 25th March 2008, 06:52 PM

Hi Scott,

Well it felt like it was at the top but, I could always turn the motor over 'til it was at the bottom and then (if it aligns up) move the rotor around 180.

Or come to think of it, just turn the motor over until the rotor arm is 180 away from plug lead 1 and then 180 the rotor arm?

Either way it's not going anywhere as it is eh?

I'll give it a shot when it stops raining.

Cheers, Pete'

**Frontier1** · 26th March 2008, 08:32 AM

OK, still no go here and it occured to me (somewhat slowly), that since the rotor arm only goes on one way and I haven't had the dizzy off, just it's cap, then it has to be simply has to be the leads right?

Or something else.......?

Test methods for ht cables please?

Cheers,

Pete'

**Frontier1** · 26th March 2008, 09:25 AM

Pic of current sequence attached, just fyi.

There are a couple of different type leads in the mix as I found some split ones recently and just grabbed some spares that I had.

Cheers, Pete'

**Tank** · 26th March 2008, 06:04 PM

Originally Posted by Frontier1

Pic of current sequence attached, just fyi.

There are a couple of different type leads in the mix as I found some split ones recently and just grabbed some spares that I had.

Cheers, Pete'

Plug leads look right, is the spring loaded brush from the coil lead in the middle of your dissy cap the same as the one you replaced is it contacting the centre of the rotor button ok, have you cleaned (carefully) any carbon or rubbish off the rotor button where the brush contacts, use a method of cleaning that doesn't leave deep scratches, fine emery paper also clean end of rotor button, let us know if this helps, also make sure your coil lead or any wiring connected to the coil is fitted properly, Regards Frank.

**PLR** · 27th March 2008, 07:53 AM

Originally Posted by Frontier1

Pic of current sequence attached, just fyi.

There are a couple of different type leads in the mix as I found some split ones recently and just grabbed some spares that I had.

Cheers, Pete'

G`day Peter , as a rule of thumb #6 lines up with the shaft body of the vacuum advance , yours appears this way in the pic .

Basic test .

If you hold your coil lead ( dist end ) 6mm from the engine block or other solid earth you should get a regular 6mm long spark while cranking the engine over.

If you do get spark hold the lead same end 3mm above the rotor , in the middle of the rotor and crank the engine you should get no spark .

If you get a spark the rotor needs replacing because it is earthing and the spark will be unable to pass onto the cap/plug leads .

Cheers

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