Coil / distributor wire question

[paulheritage]

The tachometer has never worked on my red '76 FHC and was going to swap to electronic ignition this weekend (like I did on the green '76 FHC) and thought I'd look at it at the same time. The connections look a but different, even though should be the same.
The current setup:
Coil has a blue condenser/capacitor mounted next to it connected to the + side of the coil that includes a piggy back male connector (the green car doesn't)
There's a dual white/slate connector to the + side of the coil.
There's a white/yellow connector to the + side of the coil.
There's a purple wire from the distributor to the - side of the coil.

There's a white/slate (female) wire not connected next to the coil and when connected to the - side (thought was the tachometer) means the car won't start.

All wires look original, coil is 12v.

Any thoughts if similar to others or potential tachometer fix?

Ta.

Cheers Paul,

1976 TR7 2.0 FHC, ACG 3115 - Java Green (on the road)
1976 TR7 2.0 FHC, ACG 2367 - Carmine Red (on the road)
1980 TR7V8 3.9 DHC, Orient Blue (on the road)
1977 TR7V8 4.0 FHC rally car, ACG 35005 - Tahiti Blue (complete, no MOT)

www.TR7.co.uk

[paulheritage]

I've replaced the coil.

Cheers Paul,

1976 TR7 2.0 FHC, ACG 3115 - Java Green (on the road)
1976 TR7 2.0 FHC, ACG 2367 - Carmine Red (on the road)
1980 TR7V8 3.9 DHC, Orient Blue (on the road)
1977 TR7V8 4.0 FHC rally car, ACG 35005 - Tahiti Blue (complete, no MOT)

www.TR7.co.uk

[Cobber]

Probably a short in the tacho which kills the ignition when connected, which is why someones disconnected it.
A new tacho will probably sort it out.


"Keep calm, relax, focus on the problem & PULL THE BLOODY TRIGGER"

80'Triumph TR7, 73'Land Rover (Ford 351. V8),
'89 Ford Fairlane
'98 MG-F, 69'Ford F250.
76' Ford F100

[paulheritage]

I've got a couple of spare so will start with swapping and checking the wiring for continuity and make sure there's no short.

Just not sure what the blue part to + is for, but likely to be radio interference suppressor I presume?

Cheers Paul,

1976 TR7 2.0 FHC, ACG 3115 - Java Green (on the road)
1976 TR7 2.0 FHC, ACG 2367 - Carmine Red (on the road)
1980 TR7V8 3.9 DHC, Orient Blue (on the road)
1977 TR7V8 4.0 FHC rally car, ACG 35005 - Tahiti Blue (complete, no MOT)

www.TR7.co.uk

[Steve @ SandS]

Paul, the white and slate wire should be on the coil negative.This wire is the low tension wire from the dizzy and also feeds the tacho.It has 2 outlets one with 2 wires and one with one wire but it is actually the same wire.That's why your tacho wont be working...Steve

Steve @ S&S Preparations

[paulheritage]

Disconnected the dual white/slate from the + side of coil and connected the single white/slate to the - side and everything working. The dual is left disconnected.
Previous owner must have had a problem and moved wires around.
Now time to take the distributor out and fit the stealth ignition kit. Will fit the same way as I did the green car and use both the white/slate wires.
Thanks for help Steve, no wonder there was a problem if both cables connected to + and - !

Cheers Paul,

1976 TR7 2.0 FHC, ACG 3115 - Java Green (on the road)
1976 TR7 2.0 FHC, ACG 2367 - Carmine Red (on the road)
1980 TR7V8 3.9 DHC, Orient Blue (on the road)
1977 TR7V8 4.0 FHC rally car, ACG 35005 - Tahiti Blue (complete, no MOT)

www.TR7.co.uk

[paulheritage]

Finished putting the electronic ignition in (distributor out job) and done the wiring so can be reversed if someone in the future wants to go back to standard points. I reconnected the dual white/slate wire to the black wire from new ignition pickup and all works inc. the tacho.


Cheers Paul,

1976 TR7 2.0 FHC, ACG 3115 - Java Green (on the road)
1976 TR7 2.0 FHC, ACG 2367 - Carmine Red (on the road)
1980 TR7V8 3.9 DHC, Orient Blue (on the road)
1977 TR7V8 4.0 FHC rally car, ACG 35005 - Tahiti Blue (complete, no MOT)

www.TR7.co.uk