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Electronic ignition wiring?

Started by midlife crisis , Sep 24 2012 03:56 PM

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6 replies to this topic

#1 midlife crisis

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Name:Graeme
Location:Central Coast NSW
Car:1974 LH
Joined: 17-November 09

Posted 24 September 2012 - 03:56 PM

Hi just about to throw the 253 engine into the LH. It came with a Bosch MEC 717 coil. The coil has 2 flat pins and 1 round pin and the dizzy has 2 wires but 3 connectors on it. Where do these go and what engine loom wires attach to the coil?
Thanks, hopefully pics are attached.

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#2 _lcgtarrh_

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Posted 24 September 2012 - 07:37 PM

G'Day,

Pink wire goes to positve (+) coil, Green goes to Negative (-) coil, your wire from your ignition switch also goes to positive (to turn the coil off and on with the key).

It is important to ensure you have 12V at the positive terminal of the coil (with key on). If your car has always had points it will be still fitted with a resistor wire, which will cut the volts to approx 9V, if this is the case the electronic system you are fitting will not work right.

The best way around the resistor wire is to cut it near the ignition switch and disconnect it at the coil and run a new wire.

Hope this helps,

GW

PS - You will have to put new ends on the distributor loom to use that coil.

Edited by lcgtarrh, 24 September 2012 - 07:38 PM.

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#3 midlife crisis

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Name:Graeme
Location:Central Coast NSW
Car:1974 LH
Joined: 17-November 09

Posted 24 September 2012 - 09:28 PM

Thanks Gareth,
I'm a bit of a gumby with wiring and diagrams but do you mean i need to run a new wire from the fuse box under the dash near the steering column into the engine bay, past the loom connector and straight to the + side of coil?
Also why are there three ends coming from the dizzy?

cheers

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#4 rodomo

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Name:R - O - B Dammit!
Location:Way out west of Melbourne Awstraylya
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Posted 24 September 2012 - 09:48 PM

G'Day,

Are you the Bacchus Marsh "Sparky"? :ph34r:

Edited by rodomo, 24 September 2012 - 09:49 PM.

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#5 _torbirdie_

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Posted 25 September 2012 - 06:52 AM

Thanks Gareth,
I'm a bit of a gumby with wiring and diagrams but do you mean i need to run a new wire from the fuse box under the dash near the steering column into the engine bay, past the loom connector and straight to the + side of coil?

Yes. See: http://www.gmh-toran...-elec-ignition/
The original loom should have a yellow wire that goes to the +ve of the coil, that is still needed.

Also why are there three ends coming from the dizzy?

Hard to see what we are looking at in your photo., it looks like there is a male distributor connector there.
The bullet connector looks to be what was connected to a tacho, is this a bosch dizzy?

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#6 midlife crisis

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Name:Graeme
Location:Central Coast NSW
Car:1974 LH
Joined: 17-November 09

Posted 25 September 2012 - 07:29 AM

Thanks Torbirdie, Yeah Holden Bosch dizzy, from what i have seen in other threads maybe early commodore??
It came with the engine that was out of a 73 HQ.

So just to make sure i've got this right;

* positive side of coil - original yellow wire attached from engine loom.
The new wire I run from pink wire in fusebox under dash.
Pink wire from dizzy

* negative side - green wire from dizzy and cut off the extra end?
Brown wire from engine bay loom

cheers