I'm also a little surprised by the bundle of loose wires there, as the Mk3 loom has a multi-way plug and I'd have expected the later ones to be the same.

It should pass through the left hand inner wing, over the wheel arch, then come out of the B-post and run along the floor and up the left hand A-post to where it meets the front loom near the battery tray (on a RHD car). The top branch is the connection to the main / engine loom. I'm not sure what the straggly wire is for - it's not there on a Mk3. The centre branch with the one straggly wire and a bunch of three at the end connects to the fuel gauge sender in the middle of the tank. The bottom branch in that photo is the bit that runs across the rear of the boot, connecting to the left and right light clusters and the nuber plate lamps in the middle. It's a little different to the one I've recently fitted as, like Mike, I have a Mk3. So what was simple to start has now caused a lot of headscratching.You're quite right, that is the rear body loom. White / slate is apparently the tacho drive. Others are saying to disconnect the yellow and white wire at both ends and run a 12v coil. The above, I assume, is because the 6v system will result in a weaker spark. The extra wire is because our ballast resister is within the wiring not attached to the side of the engine ' I was able to do this so completely reversible if required. 'You also has to add a separate wire from the distributor and connect to wiring under the dash near steering column. I was perhaps trying to be too clever and connect it to the existing wiring half way along the loom but that's where the confusion arose however quotes like the one below from another TR forum are also causing confusion: Once fitted the points can be refitted at any time. Red to positive on coil ,black to negative on coil. There is no wiring it only requires only 2 simple connections. The Accu Spark electronic ignition is a complete unit that completely replaces points and condenser (requires no other parts ). It was bought direct from Accuspark for the TR7 so I'm assuming - hoping - they know it's ballasted if that makes any difference at all but they say: I've just checked a few online posts / videos elsewhere and is it as simple as red to positive on the coil, black to negative on coil? I think, but it was 18 months ago, that the original points emerged to a connector down by the bellhousing - just one wire, and I think this connector is the same black and white that originally came from the points - anyone know? So: how do I tell if it's a ballasted system? (probably a ballast loom, I can't see any ceramic block) The other is white and yellow.Īny of the wiring diagrams I've consulted, Haynes included, talk of 6v coils, ballast cables, cables, white and slate, white and yellow, and three or possibly four wires from the coil to a distributor pack. It could be white and slate but it's from the coil earth. My coil has two wires, white / brown(?) and white. I've spent the last while trying to make sense of the wiring circuit but nothing that I have matches any of the manuals. The Accuspark has two wires, one red, one black. I removed the points and fitted electronic Accuspark ignition.

I'm on a roll with the TR7 and am finishing off the engine bay, but the coil / ignition circuit is causing confusion.

Tr7 wiring loom