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Owen- If you still have the conversion please provide a price and mailing address/
the unit from Meritt has a switch but requires cutting original wires and splicing new connectors/Preder not to do that/
Thanks
RJR

I had an agreed deal with someone else but have not heard back from them again since. So I'll give them 1 more day and if they are still silent, I'll PM you tomorrow with the details. I hope that's OK with you, trying to be fair all the way around.

That's fine. I have an NOS switch and the Merrit conversion. Would prefer not to install the new switch or to cut the wires.
Let me know.
Thanks
RJR

RJR, sorry but the original deal came in so it's no longer available from me. But it is still available from P.N.R.

No problem. My car seemed to self correct yesterday and I have replacements if it acts up.
Thanks
RJR

Quote:


Howard, just reviewing this installation.......
So No. 87 does not get used?
Do you just terminate the connection or remove the wire ?
I just ask as I am educating myself as to wiring

Thanks

Sean

There are two ways of making the circuit work. One which I believe is incorporated in one of the kits is to only have the brake switch control the relay and the relay in turn will do both functions -- powering the brake light and simultaneously disconnecting the TL switch. In that instance 87 will be used and would go to the brake lights.

I personally did not like relying on two switches to work the brake lights so the diagram I shared uses the brake switch alone to power the brake lights and as an added function, turn on the relay. The brake switch is designed for providing the light function and with the relay having only a minimal extra draw the switch can easily handle it. With the relay function limited to disconnecting power to the TL switch a relay issue will not result in a brake light failure and if TL is not disconnected with brakes on it is not as serious an issue to contend with. If the brake switch fails that is another matter but the reason why this conversion is being done in the first place. In this case 87 is not used but will be hot when brakes are applied. If wanted, a piece of heat shrink or tape can cover the terminal to prevent something from accidentally touching it. While not typical practice, to keep 87 from ever seeing voltage the connections to 30 and 87a could be reversed. If reversed, once the relay operated 87a would see the constant 12v but it could not be passed on to 87 and would still go to the TL switch when the relay was relaxed.

Here is diagram again -- without the stupid mistake with 87 that I quickly made when doing the original posting.

Attach file:

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  Brake Switch Relay Replacement.jpg (63.65 KB)

Thanks so much Howard! Please bare with my naivety one more time

So 87 can be terminated in some fashion,
86 gets grounded to the car
And 30 gets spiced with the purple or pink wire and installed on the switch

I got that right?

Your statements are correct. If you wanted to get a few terminals and a length of 16ga wire from the parts store you could make up a small loom so everything would just plug in the old factory 3 terminal brake switch plug on one end and the new relay and brake switch on the other. In the diagram posted below I show the colors in the factory loom but you could use all one color as long as they are marked properly so nothing gets confused.

For the terminals, the .156 bullet connector is one of two or three sizes available but is a standard diameter and should be available at almost all places that sell terminals. Some may be labeled slightly differently by one or two thousandths but still the same. Those labeled Ford are too big and there is another size that is way too small to use on the brake sw or the factory plug. The .250 female quick disconnect terminal is also a standard size. You may not find one fully insulated like I show but a bit of heat shrink tubing over the bare end takes care of that. As I mentioned in the other post if you did not want to worry about insulating terminal 87 just reverse the wires going to 30 and 87a connections at the relay. The exposed 87 terminal would never see power if that is done.

Here is the drawing to make up a small connector piece. Wire lengths would be determined by where you decide to position things.

Attach file:

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  added brake sw loom.jpg (58.64 KB)

THANK YOU SO MUCH for making this very clear for the electrical novice that I am.
Very much appreciate your help

Sean