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Figuring out my ignition wiring

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cbez Cole B
Fallbrook, California, USA   USA
Hi guys,

I am upgrading to pertronix and stumbling through lots of weird stuff that doesn't match my wiring schematic.

I have 5 different wires going to my ignition coil.

1) electric choke
2) red from dizzy
3) big black center from dizzy
4) yellow ?? enters the harness with 3 others going through ballast resistor
5) another yellow ??? passes firewall below the brake PDWA and enters harness

I'm planning to put the Pertronix coil in first and make sure everything is still working before I swap out the points. What's the 'proper' way to bypass my ballast resistor?



1971 Triumph Spitfire MK 4

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Attachments:
20171109_203957.jpg    53 KB
20171109_203957.jpg

Doug in Vegas Avatar
Doug in Vegas Douglas D
Las Vegas, Nevada, USA   USA
Tap into any white wire for your ignition.

Brad.Cogan Avatar
Brad.Cogan Bradley Cogan
RAF Cosford, Shropshire, UK   GBR
1977 Triumph Spitfire 1500 "Wray"
2007 Fiat Grande Punto "Pepper"
Chances are most of those yellow wires are actually white wires with a stripe in them. They've just discoloured over the years. Have a close look. There should be a white/brown, a white/yellow and a white/pink.

As I say those wires will have discoloured somewhat so it may be hard to tell.



Brad Cogan

1977 Triumph Spitfire 1500 'Wray'
2007 Fiat Grande Punto Active 1.2 'Pepper'

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Doug in Vegas Avatar
Doug in Vegas Douglas D
Las Vegas, Nevada, USA   USA
Actually, we're dealing with someone putting in non-Lucas colors.

Brad.Cogan Avatar
Brad.Cogan Bradley Cogan
RAF Cosford, Shropshire, UK   GBR
1977 Triumph Spitfire 1500 "Wray"
2007 Fiat Grande Punto "Pepper"
In reply to # 1497076 by Doug in Vegas Actually, we're dealing with someone putting in non-Lucas colors.

Noooooooo. I'm out then I have no idea haha



Brad Cogan

1977 Triumph Spitfire 1500 'Wray'
2007 Fiat Grande Punto Active 1.2 'Pepper'

TinDrum Herald Ma
cologne, NRW, Germany   DEU
sorry, wrong picture

Herald



Edited 1 time(s). Last edit at 2017-11-10 07:21 AM by TinDrum.

colodad Avatar
colodad Silver Member Calvin Williams
Grand Junction, Colorado, USA   USA
If the wires are not Lucas colors, PO replaced bad wires, so we sort it out.
the coil positive terminal is used like a junction box, one wire is power in from the ballast resistor, another is from the starter solenoid by passing the ballast resistor for full power, other wire goes to what needs power, like the electric choke.
coil negative is the dizzy points firing the coil through the center high tension wire to the dizzy cap.
Coil could be a 6 voil 1.5 ohm, using the ballast resistor.

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Doug in Vegas Avatar
Doug in Vegas Douglas D
Las Vegas, Nevada, USA   USA
That picture looks very familiar.

Doug in Vegas Avatar
Doug in Vegas Douglas D
Las Vegas, Nevada, USA   USA
In reply to # 1497111 by colodad If the wires are not Lucas colors, PO replaced bad wires, so we sort it out.
the coil positive terminal is used like a junction box, one wire is power in from the ballast resistor, another is from the starter solenoid by passing the ballast resistor for full power, other wire goes to what needs power, like the electric choke.
coil negative is the dizzy points firing the coil through the center high tension wire to the dizzy cap.
Coil could be a 6 voil 1.5 ohm, using the ballast resistor.

Looks like the external ballast resistor isn't hooked up. It should have a white wire on one side and hook to the + side of the coil on the other while the - side of the coil goes to the dizzy and the electronic tach (if so equipped).

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colodad Avatar
colodad Silver Member Calvin Williams
Grand Junction, Colorado, USA   USA
coil positive: number those 3 wires as you remove them.
with the key on, the ballast resistor wire should be the only hot wire, the other 2 should not be hot.
If you know 1 goes to the electric choke, then the other should come from the starter solenoid.
The electric choke needs power to un-choke the carb as the internal bymetal heats up, moving choke position.
While the starter is engaged the final numbered wire will have full 12 vols,

colodad Avatar
colodad Silver Member Calvin Williams
Grand Junction, Colorado, USA   USA
Doug, the PO could have sent the Ballast wire into the wire harness then to the coil, shouldn't we check the wires at the coil see what the voltage is ?

In reply to # 1497115 by Doug in Vegas
In reply to # 1497111 by colodad If the wires are not Lucas colors, PO replaced bad wires, so we sort it out.
the coil positive terminal is used like a junction box, one wire is power in from the ballast resistor, another is from the starter solenoid by passing the ballast resistor for full power, other wire goes to what needs power, like the electric choke.
coil negative is the dizzy points firing the coil through the center high tension wire to the dizzy cap.
Coil could be a 6 voil 1.5 ohm, using the ballast resistor.

Looks like the external ballast resistor isn't hooked up. It should have a white wire on one side and hook to the + side of the coil on the other while the - side of the coil goes to the dizzy and the electronic tach (if so equipped).

Doug in Vegas Avatar
Doug in Vegas Douglas D
Las Vegas, Nevada, USA   USA
Here's my current setup.

Maybe it can help.


Attachments:
Lucas Electronic Ignition and 6v Coil (mine).jpg    23.8 KB
Lucas Electronic Ignition and 6v Coil (mine).jpg

cbez Cole B
Fallbrook, California, USA   USA
My ballast resistor is wired up. 4 wires come out of the harness that's going from starter solenoid to my fusebox.

Two go to one side of resistor (WY), one goes to opposite side (solid yeLlow?), fourth goes to ignition coil (WY).

When I say white it is more like a lighter yellow I assume has discolored.



1971 Triumph Spitfire MK 4



Edited 1 time(s). Last edit at 2017-11-10 01:05 PM by cbez.


Attachments:
20171110_105310.jpg    47.5 KB
20171110_105310.jpg

Doug in Vegas Avatar
Doug in Vegas Douglas D
Las Vegas, Nevada, USA   USA
Check if the pink wire with the white stripe is being used to power the resistor.

This will drop your 12v down to 3v.

cbez Cole B
Fallbrook, California, USA   USA
I don't have a pink with white. I cleaned wires up some maybe that helps.



1971 Triumph Spitfire MK 4


Attachments:
20171110_111210.jpg    50.4 KB
20171110_111210.jpg

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