Where does the reversing light wire run under the passenger seat?

[GrahamFountain]

I hope someone can help here.

The reversing light wire had a repair in it somewhere behind where it ran from the loom above the gearbox. I've managed to pull that apart somehow while doing the Wedglok screw in the 1st/2nd selector fork - it looks like the repair was just the wire ends bared and twisted together, and wrapped in insulting tape.

Anyway, I have the end of the wire nearest the switch, but I can't see where the other side of the repair is. Does the wire ruin back under the carpet or under the car floor above the propshaft? And where does it join the loom going into the boot?

The wire itself is in a rather poor state - very brittle insulation -, and I think I should replace as much of it as I can get at. I'm thinking of a couple of 4.7 mm bullet connectors where there's access.

Graham.

[Carledo]

Reverse light wiring is part of the "overdrive" loom a plain green feed (fused ign live) runs from a 5 wire multiplug near the clutch master cylinder to the reverse light switch and then on to the overdrive switching. A second (green/brown) wire runs back from the reverse swtch to the same 5 way multiplug and thence into the main loom and off to the reverse lamps. This multiplug is identifiable by the loop of large white/red wire which is the auto inhibit switch bypass on a manual car. the 5th "hole" in the plug is unused.

HTH Steve

[GrahamFountain]

Thanks Steve,



I know the above isn't as clear as it might be, but it wasn't taken for this reason; but part of so I could see what went where for when I put it back together. Unfortunately, this is the most rearwards one of that set.

But one of them dirty pale brownish wires (I should have looked at the colours, you're right) off the top switch, rather than going to the connector, appears to have gone directly back out of the area covered by the gearbox cover, either under the carpets (I hope) or under the body (I hope not) beneath the passenger seats. I know it went back that way, cos it 'P'd me off that I couldn't pin that overdrive loom section up under the dash and out of the way. That's the one that has broken, and which I can't find the other end of. It don't run with them speaker cables on the left of the pic, and I can't find it joining the feeds to the boot under the sill cover carpet. So I think it has to be under the car, in the transmission tunnel.

So it must be a patch that someone put in from underneath. I guess I'll look for the where it goes into the boot and see if I can work out why it's been patched - if it don't rain too much over the weekend.

At least I finally got to replace the clutch pedal with one where the hole for the clevis pin is very nearly round, not well oblong. That made it so there couldn't be much carpet under the pedal, or it grunted mightily going into reverse.

Graham

[GrahamFountain]

All sorted now. Not having looked at the wiring diagram - and not having one for the overdrive -, I confused the wiring for the OD switch with the reversing light wires. The wire I broke was the feed to the OD solenoid that ran back under the tunnel then forwards to the solenoid, where it was disguised by the earth connection and 14 feet of insulting tape. So, all that happened was the Lucar pulled off the wire end - easy fix.

In my defence, I was somewhat stressed about the two missing gears and what I might find when I got the gearbox cover/extension off. So I didn't look at the wiring with as much care as it turned out it was due. But all that is sorted, and I only have to fit the cover, rebuild the parcel shelf, wire the stereo back in, and fit the carpets.

Graham

[Carledo]

I'm hesitant to make a circuit diagram for the O/D for you as someone will undoubtedly tell us it's wrong, no matter which way I arrange it!

There seems to be little consistency in any case as i've seen several different iterations of the same circuit in what appear to be factory wiring looms.

What IS consistent is that the plain green ignition live feed originates at the 5 way multiplug and it's first destination is the reverse light switch.

Most sources (including the Haynes book of lies which I have used today) agree that a further green wire is then looped across from the same lucar on the reverse light switch which goes to the gearstick O/D switch. On the ouput side of the O/D switch, a BLACK wire runs to a single bullet connector where it turns into a green/yellow wire and heads for the 3/4 lockout switch, then on the output side of the lockout switch there is a yellow/purple wire to the solenoid. Then a black from the solenoid to earth. Which is enough colour changes to have even the most patient electrician tearing his hair out!

One thing to bear in mind is that all 3 switches (reverse, overdrive and lockout) are omnidirectional so it doesn't matter which wire goes to which tag. Nor, to a large extent, does it matter in what sequence you put the switches in the circuit so long as the current goes to or through all of them.

My normal inclination (though i've seen it done this way in probably factory sub looms) is to alter the circuit so the lockout switch comes first. If the wires are badly deteriorated to the O/D i'll chop the green extension at the reverse switch and start a new lead under it with a piggyback spade. If the green is still usable, i'll shorten it a bit and tag it to the lockout switch, saves a lot of duplication. Then, keeping to a single colour, preferably green or green with a trace, run a single lead from lockout to gearstick switch and switch to solenoid. (Don't forget the earth lead!) Job done!

HTH Steve

[GrahamFountain]

I thought there was a diagram somewhere: https://forum.triumphdolomite.co.uk/vie ... se#p342425

Graham