6 replies to this topic

[SolarB]

Does anyone know the current drawn by a Ford EDIS 4 unit?
I’m planning the additions for my wiring loom over the weekend and doing my sums like a good boy.

[Ethel]

Not much depends how you wire it all together - the coilpack will use about 10amps

http://www.megamanual.com/ms2/EDIS.htm - the capacitor will be to combat radio interference.

I've seen diagrams where people have added blocking diodes to the grounds as an extra precaution.

[SolarB]

Cheers Ethel, I haven't seen that website before.
Will have a look tonight, but are you sure about the 10 amps? that sounds a lot.

[Ethel]

It's the figure I've got jotted down but I can't remember why

The coilpack should be about 1 ohm, which gives 12amps at 12 volts, though that would be the maximum instantaneous current: since it constantly switches on & off to make sparks it would be effectively less & less as the revs increase and it switches more often.

[Ethel]

Sounds good, I'd be inclined to run the MJ & edis off a separate feed from the coil pack, they should draw very little current.

[SolarB]

Thanks for the advise. I intend to power the EDIS and the MJL from one source and the coil from a separate source.

I was going to allow 3 amps for the EDIS/MJL but I've just realized that the whole system will run without an engine if I spin the trigger wheel in front of the VR sensor. I'll set the system up on the bench, run it off a couple of power supplies and measure the current drawn by each unit.

[Ethel]

It should consume as much current without the crank input signal. You can simulate it from a pc parallel port if you want a bench test set up.

Fair point Dilligaf, if you wire the rev limiter to the board.