Topic: 70 Convenience Group ?

[rayms69]

a couple pics of the harness would be good to look at, there is a black with a yellow stripe I am interested in, my sportlamp switch has this wire and the harness has it also, like they should be together, thanks for your help

[midlife]

I just put the dash in last night, but I have my old harness and can see where they go.  The old harness doesn't have the connector - a previous owner cut it off.  The harness I used is the reproduction, so somebody, somewhere is making that connector.  The new harness came from NPD, but I can't remember who it is made by.

That's likely Alloy Metal out of New York.  I believe they mold their own connectors.  NPD doesn't list a sportslamp variant of the 70 harness, but most 1970 harnesses can be ordered as "specials" from them.

[70Mach]

I don't know if these will help, in the new harness I believe there is a black and a black/yellow wire joined together into a single connecter.  My old harness has them stripped and twisted together.  The gray wire from the sports lamp connector and the black/yellow wire go to the green connector for the fuse block.  The black wire goes through the firewall and into a bullet connector that has a blue/red wire going into the same bullet connector.

[rayms69]

Thanks 70mach,  appreciate your help

[70Mach]

Glad I could help.  I have one more question on the sport lamps. Do the front valance park lights shut off when the sport lamps are turned on?  Got all the lights hooked up this weekend and the front park lights ( under the bumper) don't work, the new underdash main harness I installed doesn't have the black yellow wire in it! Ahhhhhhhhh! Could have swore i doubled checked all connectors to the old harness but must hsve missed that one.  So it would appear that the sport lamp switch should have 3 wires going into it. The terminal on the SL switch without a wire, where the black/yellow wire should be is hot with the lights on & SL switch off. Turn the SL switch on and and it goes dead.

[midlife]

The 70 wiring schematics do have three wires going to the sportslamp switch, but in practice (about 10 70 Mach 1's), I've never seen that configuration---only two wires.  As previously mentioned, it was possible that there was a mid-year change from 3 to 2 wires early on in the model year.

[70Mach]

So on the ones you have seen with two wires, which wire is not there?  The black/yellow wire?  With only two wires, I wonder if the park lights were ON with or without the sport lamps being on.

[rayms69]

I'm thinking the black/yellow wire serves a purpose, right now I do not have mine black/yellow is not connected (taped off) and the black goes to PRND1 light, sport lamps work because the gray wire is hooked up.my turn signals keep popping the fuse, but the turn signals are installed so I wouldn't expect them to work properly. When I purchased my headlight wiring harness,  the key question was build date because they went from 11 to 10 wires from firewall to lights. I think it was around 10-15-1969.

[70Mach]

The black/yellow wire is the power wire to the park lights under the bumper.  The rest of the park light circuit is powered by a brown wire.  The new underhood harness I used has the black/yellow wire going from the park lights to the firewall connector.  But the new under dash harness does not have it, and my old harness does.   

Ray, I think this is the way yours is working: The sport lamp switch is getting power from the PRND1 light, when you turn the SL switch on it sends power through the gray wire to light the bulbs.  Since you do not have the black/yellow wire, the valance park lights are either not working or they're powered by a different source (probably the brown wire that powers the rest of the park light circuit).

[70Mach]

After talking to NPD, there were 4 different under dash main harnesses for 1970.  The early versions had a 3 wire Sport Lamp circuit the later versions had 2 wires, the black/yellow wire was deleted.  I'm guessing on the later version 2 wire Sport Lamp circuit, the front valance park lights were on the rest of the park light circuit and powered by a brown wire. 

To correct my issue I need to either replace my under hood harness with a later version to match the later under dash harness.  Or I need to add the black/yellow wire into the under dash harness.  I would like to add the wire into this harness, but I don't know where I'll find a female terminal to add into the sport lamp connector.  Any ideas?

[midlife]

After talking to NPD, there were 4 different under dash main harnesses for 1970.  The early versions had a 3 wire Sport Lamp circuit the later versions had 2 wires, the black/yellow wire was deleted.  I'm guessing on the later version 2 wire Sport Lamp circuit, the front valance park lights were on the rest of the park light circuit and powered by a brown wire. 

To correct my issue I need to either replace my under hood harness with a later version to match the later under dash harness.  Or I need to add the black/yellow wire into the under dash harness.  I would like to add the wire into this harness, but I don't know where I'll find a female terminal to add into the sport lamp connector.  Any ideas?

The terminal pins can be found from Cougar power window assemblies as well as some of their toggle-switch convenience items.  I can provide a couple female pins if you want them.

Yes, the black/yellow wire appears to have been an early version of the valence lights: I've seen that used about 10% of the 70 headlight harnesses I've refurbished.  That wire is next to the two turn signal wires on the top line of the connector where the large power pin is.  Most of the time, that hole is empty.  the few times I've seen it on an underdash, it ties directly to the headlamp switch itself.

[70Mach]

Thanks for the tip on what else has them!  I'll see if I can find something. I knew there had to be something else. 

So the ones you saw tied directly to the headlight switch, was it with another wire into one terminal?  The same one that powers the other park lights?

[rayms69]

When I bought my headlight harness,  bill upham asked me what my build date was (10-20-69 Dearborn), does anyone know whAt the change over date was? I thought it was 10-15, but my car has the black/yellow cut on the main harness,  as if it was used. Signed wtf

[midlife]

Thanks for the tip on what else has them!  I'll see if I can find something. I knew there had to be something else. 

So the ones you saw tied directly to the headlight switch, was it with another wire into one terminal?  The same one that powers the other park lights?

Only one wire, directly from the headlight switch into the firewall plug.  I don't remember what happened on the engine side, as I refurbish fewer headlight harnesses than underdash.  I have almost every year underdash harness memorized (yeah, I know...I'm sick).

[70Mach]

If your underhood harness has the black/yellow wire, I think you will need to have the black/yellow wire hooked up in the sport lamp connector.  If your underhood harness doesn't have it, then I don't think the black/yellow wire will be needed in your underdash harness.  If you have an original underhood harness it could be green/yellow - that's what the wiring diagrams I've seen say. Although they show green/yellow all the way to the sport lamp switch.  My original underdash harness had the black/yellow wire. I'll have to look at my original underhood harness to see what color it is.