PDWA Wiring

[RagTopMan]

Thanks Greg. Your confirmation of my set-up helps a great deal. Maybe we're both wrong but since it appears that each of our cars is working correctly... I'm going with it!

 

[hondo402000]

well you could use your multi meter and see if the white wire has voltage when the ignition is in the off position, then in the on position, and just ground that black wire, cant have too many ground wires on a british car

if the white wire is hot use it for some gadget( engine compartment lamp)

Maybe both the black and white could have been used for the optional Overdrive unit???

Hondo

 

[hondo402000]

Just looked at the OD section in the wiring diagram, their is a black wire and a white in the OD diagram I could assume thats where those wires would run if you had a overdrive, maybe someone with a TR250 and Overdrive can confirm that

Hondo

 

[angelfj1]

I did read your post Frank. I'm just slow to come around to the idea of a lead that clearly looks to have been there for a purpose being taped up and tucked away. Then again, some would say I'm just slow period. :frown:

<span style="font-style: italic">Bob: Sorry, I meant no disrespect. Your photo looks OK to me and others have said the same. </span>

So the white wire (almost entirely encased in black shrink wrap) coming from here and leading to the coil is my ignition source?

<span style="font-style: italic">Yes, if you connect a test lamp to that wire it should light up when the ignition key is turned ON.</span>

Question: Is your alternator a Lucas type 15AC?

Thanks , Frank

 

[RagTopMan]

<span style="font-style: italic">Bob: Sorry, I meant no disrespect. Your photo looks OK to me and others have said the same. </span>

So the white wire (almost entirely encased in black shrink wrap) coming from here and leading to the coil is my ignition source?

<span style="font-style: italic">Yes, if you connect a test lamp to that wire it should light up when the ignition key is turned ON.</span>

Question: Is your alternator a Lucas type 15AC?

Thanks , Frank

No worries, Frank. I really do appreciate your help with this.

Yes, that is a Lucas 15AC alternator.

 

[RagTopMan]

Just looked at the OD section in the wiring diagram, their is a black wire and a white in the OD diagram I could assume thats where those wires would run if you had a overdrive, maybe someone with a TR250 and Overdrive can confirm that

Hondo

By God I think you've stumbled onto something here! I definitely do not have overdrive so this makes a whole lot of sense.

 

[glemon]

I have been studying wiring diagrams, it appears to me the white wire that goes to nowhere may be the wire for the fuel pump on the petrol injection cars.

The charts show a white wire going to an electric fuel pump on those cars, maybe they used the same wiring harness.

I just read the Piggot originality book and it says only the first 24 or so TR5s had the fuel pump in the engine bay, so maybe that shoots my theory or maybe they had ordered up a bunch of harnesess to the early spec and used them up?

Just an idea.

 

[angelfj1]

I have been studying wiring diagrams, it appears to me the white wire that goes to nowhere may be the wire for the fuel pump on the petrol injection cars.

The charts show a white wire going to an electric fuel pump on those cars, maybe they used the same wiring harness.

I just read the Piggot originality book and it says only the first 24 or so TR5s had the fuel pump in the engine bay, so maybe that shoots my theory or maybe they had ordered up a bunch of harnesess to the early spec and used them up?

Just an idea.

Not likely since PI cars, electric fuel pump was/is located in the boot.

 

[DNK]

Wasn't there something above about the first cars had pumps in the engine area?

 

[glemon]

I have been studying wiring diagrams, it appears to me the white wire that goes to nowhere may be the wire for the fuel pump on the petrol injection cars.

The charts show a white wire going to an electric fuel pump on those cars, maybe they used the same wiring harness.

I just read the Piggot originality book and it says only the first 24 or so TR5s had the fuel pump in the engine bay, so maybe that shoots my theory or maybe they had ordered up a bunch of harnesess to the early spec and used them up?

Just an idea.

Not likely since PI cars, electric fuel pump was/is located in the boot.

I think I noted that in my post.