Engine wires identification help please

[chewbacca]

Hi guys

There's a loom comes out straight in the middle of the engine at the top.
There's a wire I've terminated to the temp sender, but I can't see the colour of that. Same for the wires going to the header tank. I earthed the sender to the earth for the header tank.

There's 4 more I need help with.
Thick red - disappears underneath the inlet manifold. (Heater plate?)
Thick black - is a home made affair that splits into 3 & attaches to 3 different places in the carb.
Green/Black - disappears off under the engine somewhere, maybe onto a head?
Brown/Black - not attached

Thanks in advance

[itchyfeet]

Mmm didn't mention this in the 2 rads overheating thread?
https://club8090.co.uk/forum/viewtopic.php?f=37&t=139083" onclick="window.open(this.href);return false;

Again as you haven't put your engine or year in signature this is missing from this post?

Temp guage sensor in therm housing is yellow/red and other side brown to earth
low level sensor in tank is blue/green and other side brown to earth
manufold heater switch in thermo housing is black ignition positive lilac/black to relay

red over engine from manufold heater relay goes to manufold heater and carb part load duct heater
black over engine is ignition positive 12v and goes to bypass air cut off valve, and auto choke

check where this last connection on the black goes, this and the red are unfused so a short here will melt wiring, if it looks poor remake it or at least insulate it.

[chewbacca]

Thanks for the reply.

Mmm didn't mention this in the 2 rads overheating thread?
https://club8090.co.uk/forum/viewtopic.php?f=37&t=139083" onclick="window.open(this.href);return false;

It's sort of been 1 job at a time. I didn't think this was relevant to be honest.

Again as you haven't put your engine or year in signature this is missing from this post?

Could have sworn I'd done that. Done now.

Temp guage sensor in therm housing is yellow/red and other side brown to earth
low level sensor in tank is blue/green and other side brown to earth

I'm fairly sure they are all good now.

manufold heater switch in thermo housing is black ignition positive lilac/black to relay

I'm not sure what these are.... 2 wires, 1 black the other lilac with black strip? Currently missing completely.

red over engine from manufold heater relay goes to manufold heater and carb part load duct heater
black over engine is ignition positive 12v and goes to bypass air cut off valve, and auto choke

Something not right here then. My red wire appears to go to only 1 place under the inlet manifold & the black to 3 different spots on the carb.......


Any ideas on the other 2 wires?
Green with black strip the disappears off under the engine
Brown with black strip not attached

Thanks for the help.

[chewbacca]

Sorted.
Fresh pair of eyes today & I can see what's been done.....

Green black wire is the oil pressure light.

The white relay, inside the wiring box in the engine bay, isn't connected.
It has a battery +ive from the terminal bolt inside the box.
The output red wire is only connected to the manifold heater, the second wire has been cut off, explaining the now 3 black wires going to the carb. (ignition +ive)
The coil switching the relay is connected to ingnition +ive on one side & the other is the disconnected Brown & black wire. It should go to the temp switch on the thermostat housing, then to earth.

[chewbacca]

red over engine from manufold heater relay goes to manufold heater and carb part load duct heater
black over engine is ignition positive 12v and goes to bypass air cut off valve, and auto choke

Any chance of a bit more clarification please?
I've got the temperature switch working so hopefully tomorrow night I can wire in the relay & have this functioning as is should.

If I get the relay working correctly, currently the 3 black wires on the carb will be ignition feed & the big red wire underneath the carb will be on when the engine is cold.

If I understand correctly, one of the 3 black wires should also be switched off when the engine warms up. (Connected to the red wire instead of ignition)

That sound about right?

[itchyfeet]

Yes heater relay circuit should power manufold heater and part load duct heater, thats the one at the base of the carb with a wire on it
auto choke heater and cut off valve at top of carb wire to ignition pos

never understood why choke heater is not switched off when hot, Haynes shows it this way, possibly was on early vans but definately not on all the later vans I have seen.

[itchyfeet]

Haynes shows late van is wired black ignition pos to thermoswitch in thermostat housing, then lilac/black to relay coil, then other side of coil to earth.

Consider adding inline fuses to the ignition pos and heater feed 12v in the black box, engine electrics are not fused, if one of these wires rubs through on a hot vibrating engine your wires melt.

[chewbacca]

Thanks, but I'm good on that bit. It's the 4 connections on the engine side I'm not sure about (carb area). The switch is fine now & triggers the relay as it should. I just need to wire it up permanently.
The fat red wire is temperature switched & currently only goes to what I presume is a heater plate below the carb.
Also on top of the engine is a black ignition wire that is split into 3, each of these 3 wires goes to a connection on the carb. I believe 1 of these 3 wires should actually be switched on only when cold, not when the ignition is on, so should be connected to the red wire instead.
I'm just not sure about this & if I am right, I have no idea which of the 3 black wires should be rewired to the red one.

[itchyfeet]

Thought I was pretty clear in my first post above from yesterday^^^ part load duct heater move to red which is the relay switch citcuit.

[chewbacca]

Sorry, I must have missed that first post.
That's great, thank you.

[chewbacca]

Hi guys
Sorry for dragging up a really old topic, but I'd just like to check I have this correct now.....



In the above picture (numbered 1), I have the wire marked A going to the temperature controlled relay, meaning it turns of when the engine is warmed up. It disappears down the back of the carb, I guess underneath it. The plate underneath the manifold is wired to the same relay.




In this second picture (2) the wires B & C are wired to ignition. These wires come out of the bottom front left corner of the carb.

Do I have that right finally please?

Many thanks.

[chewbacca]

Anyone?

[Mocki]

From what I can see in your pictures, it's correct .

[chewbacca]

Thank you mate, that's great

[seanmc1970a]

My wires are very confusing and are all over the place, so wonder if someone could help with wire c on pic 2. Where does it go to?