Electricy Help

[Keith66]

Hi All

Electricity advice.

So I’m on a long and fairly slow restoration of a 72 Pi, with overdrive (OD) and I’m at the stage where I’m installing a new Autosparks harness.

Now I’m no auto electrician but I can kind of understand a wiring diagram and most things have gone together ok with the help of an Advance Autowire wiring diag. But even that didn’t go to smoothly as I was using a 72 diag for my 72 car without thinking that as my car was a 71 build it is more like the 70-71 diag, well the OD bit is anyway, so I’ll assume the rest is.

Had some good help from Lightningburns about the OD switches and pretty happy about those now but the rest of the OD wiring is not clear enough for me.

So I’ve got some (probably) stupid, obvious questions I could do with some help with.

Firstly the wire from my OD solenoid is purple and either Grey, Greenish or maybe yellow. Am I safe to assume that should be YP as my Autosparks harness and diagrams show?

The Autosparks OD wiring harness itself (Code 865 on their site) connects to the relay ok with all wires and colour as per diagram, but the other end is not so simple for me.

So it’s one bunch of cables at the relay end and splits into two for the final foot or so. Now I get (hopefully) that the YG feed goes to the OD stalk and the YP feed goes the the OD solenoid but not sure where the plain yellow wire that accompanies each one of these goes? There is a plain yellow that is in with the OD inhibiter switches, but appears to go nowhere I can see? Is there is a yellow that links to the overdrive stalk as there does not seem to be one on the stalk itelf, though I may need to check again. There is also a black wire with a ring terminal which I assume is the earth that connects to the gearbox, but is there any specific bolt to cone?

Also for the Reverse light switch, I can see from the wiring diag that it’s a green feed but how do I tell which is the correct one, or does it not matter which it is?

So any help would be welcome.

Cheers

Keith

 

[JochemsTR]

Hello keith,

this may help you

 

Concerning the rear lights....

 

Jochem

 

With electric....it is alway hard to describe the wiring in text....try to add as many pictures as you can.....

Edited May 3, 2018 by JochemsTR

[colin3511]

Keith,

 

Remember there is an additional loom that connects the relay, stalk and overdrive solenoid/gearbox switches. This does not come with the harness as overdrive was an option.

 

Colin

[john.r.davies]

Keith,

Are you using a multimeter to help you?

The many measurements available that make it "multi" seem confusing, but there are a few that are really useful:

Volts - set to "20" - is there a voltage coming to this connector, and is it switched by the switch I think it is?

Continuity (or Ohms Ω ) - there may be a continuity setting or set to the lowest Ohms range - are these two connectors, whose wires disappear into the wrapped loom, on the ends of the same wire? The same will tell you if a switch, like the 3/4th gear or reversing light switchs on the gearbox are working.

 

If you can rig up a 12V bulb and battery with leads, this can do the same job, but it's fiddley!

John

[lightningburns]

Keith,

You can connect up the Black ring terminal under any suitable bolt on the gearbox, The extra yellow wire going nowhere on the Autosparks gearbox loom maybe to extend the solenoid wire to the front of the gearbox. The solenoids did sometimes have non standard colours on some of them, also the single wire from the solenoid can be very short on replacement coils so the new loom may cater for this.

You should have just the two wires leading forward to the front of the gearbox, one to the solenoid and one to the inhibitors as per Jochem's diagram.

The reverse switch just shorts out when reverse is selected, so it does not matter which way round you connect the green and green/yellow on the switch, but they should be the correct wires, although in theory any green live battery feed would work that would be a bit risky .

The extra Yellow wires are a puzzle in the relay loom as I can see no Yellow wires in wiring diagrams other than gearbox inhibitors on TR250 to last of the TR6. I cannot see what they would be used for, perhaps a call to Autosparks.

 

Good luck,

 

John

[Keith66]

Hi All

Still plodding alone with my wiring, but a little ill health has slowed things a little so it’s taking far longer than it should. But as Jochem says a picture is better than loads of words.

So here a couple.

As you can see I from the labels I have all the wiring I need new from Autosparks, but currently looking at finishing the OD, connecting both the OD Relay Harness (Autosparks code 865) and the Gearbox/OD Harness (Code BC58).

So one labelled pic and another from a diff angle and a few questions.

1. Can the black earth (ring connector) connect to any bolt on the GB?

2. Hopefully I’ve got the OD inhibitor (Actuator) switches correct now, does it matter in what order they are connected as long as they are?

3. My OD switch connectors don’t lie flat, the originals did and does it matter as I bust one new one trying to bend the tangs or will they foul the GB tunnel?

4. Assuming harness 865 connects to BC58 via the snap connectors as shown.

5. Assuming that the 2^nd spur off 865 goes the the column OD switch (if I can find the correct wires)

Just looking for a little reassurance I’ve got things right so far and more than happy to be told I haven’t as I’m no auto-electrician.

Cheers

Keith

 

[stallie]

I've just acquired a CP71 Commission Cp541xx-O and have yet to find much modified on it or fiddled with. This pic might help you.

 

 

[JochemsTR]

Keith,

you can connect black earth (Ground) anywhere you like. I always check with a Ohm-Meter to ensure 0 Ohm is there, this ensures proper Ground connection.

The OD switches lay flat. Just bend them carefully. There is no particular connection order....

 

You can test the switches by adding power and measure voltage before and after shifting into 3rd, 4th.....and by looking if your reverse lights work....

 

Jochem

Edited May 18, 2018 by JochemsTR