Dynamators & electronic ignition.

[hotendlad656]

I see that ACCUSPARK make a dynamator ( an alternator disguised as a dynamo) that should fit my Jag Mk2 3.4.
Has anyone experience of this, if so how easy is it to fit.
Accuspark also market electronic ignition that again, should be a simple replacement - has anyone experience of this as well

[PPV]

I have used the Accuspark ignition and its works very well. No problems fitting as instructions easy to follow. Had it installed for several years and not had to touch it.

[bigcat1]

I have just fitted a Dynator alternator from Wosperfprmance. It was relatively straightforward. I fussed about the wiring connections to make sure I didnt get it wrong. I replaced the wire from the alternator via the control box to the ammeter and from there to the solenoid with new heavier duty wire as the output from the alternator is greater than the dynamo. I used the control box as a wiring block for the various connections to be made. I also replaced the ammeter with a 60amp version as well. I left the original wiring in situ as it would have been very difficult to remove. I ensured that each end of the old wire was securely sealed with heatshrink tubing so there's no chance of it shorting out on something.
I had a bit of confusion when I got to the solenoid. I was expecting three wires on the post but there were four. There was the battery feed cable. The wire from the ammeter that I was replacing and the wire to the fuse block. But what was the fourth wire? After a bit of hunting around with the multi meter I discovered that this is a 12v feed to the 6RA relay in the fuse block area. This relay controls the horns. But why isn't it shown in the wiring diagram?
I had quite a bit of messing with the pulley as I had to use the dynamo original as the supplied pulley had a different V profile. Quite a bit of time was spent ensuring that the pulley was exactly in line with the water pump pulley. (The Dynator comes with two washers and two spacers to give a range of options.)
It all appears to work correctly so I am pleased with the conversion. I have only done this as I am about to fit electric power steering from EZ power steering. I think the current draw might be a strain for the original dynamo.

[PPV]

Just to say that the wiring diagram in my manual shows 4 wires on the solenoid and one goes to the A4 connection on the fuse unit ( middle of page on the RHS of diagram on page P.41). Then if you look at the horn connections (top of page to left of centre on page P.41) it shows them being connected to the A4 terminal. There is no relay involved originally.
Regards,

[bigcat1]

Hi, in the 'supplementary information to section P 'electrical and instruments' (page P-s. eight) in the service manual there is reference in the description of Horns-Model 9H to the Lucas 6RA relay and a brief explanation of how the circuit is energised. Clearly, my 1961 model 3.4 had this 'enhancement'.
Now looking at the Haynes manual wiring diagram for 240/340 models, the relay is shown with the extra wire on the solenoid post.

Feeling fairly pleased with myself as the wiring diagram confirms my hand drawn sketch of how the wiring must be if a relay is in place. But feeling a little daft in that it never occurred to me to look at the later wiring diagram!

This is part of what I love about the Mk2. There's always something new to learn. Whilst at times it can be very frustrating, it is also very rewarding when you successfully repair or upgrade some part of the car,

[PPV]

I thought that that part of the supplement applied to post chassi numbers of 169762 for the 3.4 and that was close to the end of the run in 1967 for RHD models. So a mod done sometime?
At least you found the solution and as you say it is on the 340 wiring diagram.

[hotendlad656]

Many thanks for your replies on electric ignition & dynamators - they have been most helpful.
Like "bigcat1" I'm also looking to fit power steering after changing to a dynamator. I understand that 'EZ' can provide the necessary mechanism, but I've also seen 'Lite-steering' supplying something similar - both electric. Has anyone experience of either type, they both cost about the same - about £2000 I think.