Topic: 70 Convenience Group ?

[70Mach]

Last night was the first time for a battery test on the electrical system before the dash goes in and the front of the car is assembled.  Opened the door and the buzzer started along with the left sail panel light coming on, excellent!  But the right sail panel light wasn't, hmmmm.  Then, with the driver's door open I turned on the lights, blew the courtesy light fuse.  All wiring harnesses that are available reproduction have been used - Metal Alloy Products brand.  The convenience group harness was not replaced because I don't think it's available reproduction.  But it's not hacked up and didn't see any issues with a good visual inspection before I reinstalled it.  Has anybody seen this issue before?  It was late when I hooked it up so didn't mess around with it too much.  For one, I probably need to have the door shut and see if it still blows the courtesy light fuse when I turn the lights on.  And I also need to check the bulb/circuit for the right sail panel.  Although I would think if that was the problem it would just have blown the fuse right away when I opened the door.  I think it's two separate issues but have not confirmed that yet.  Just seeing if anyone else has had a similar issue with replacement harnesses or the Convenience Group system.  Thanks!

[70Mach]

Okay, finally got to work on it again.  I checked and didn't have the passenger's side door switch circuit completely hooked up.  Once I did that, the passenger side sail panel light works.  I still have the fuse issue though.  With the key off (left in ignition), driver's door open, buzzer buzzing, interior lights lit up, and I turn the light switch ON it blows the courtesy light fuse which kills the interior lights and the buzzer.  Then with same scenario except the driver's door closed the fuse does not blow.  Any ideas? I didn't take this car apart and don't have any prior experience with this system. One thing that is bothering me is a connection that I had made when assembling the harness.  Towards the center of the dash there is a blue w/red stripe wire and a black wire going into 1 connector.  I plugged that into a black wire coming off one of the connectors for the lights "ON" indicator relay that is right under the buzzer. On these two connectors one is black the other is white, but they are the only ones that are 'mates'.   When I unplugged that connection, opened the door, key off (key left in ignition), and turned the lights on the fuse didn't blow, the buzzer buzzed and the interior lights came on.  But the light for the shift indicator wasn't lighting up (although I don't know if it was before I unplugged the connection either).  I traced the blue/red wire w/ black wire connector to the transmission shift indicator light. 

Also at times, when working around the buzzer and the relay, with the key out of the ignition and the driver's door open the buzzer would start buzzing slightly.  If I pushed the driver's door switch in it would stop even and when I let go of the door switch it would continue to be off and occasionally would start slightly buzzing again when I touched the buzzer or relay below it.  That makes me think I maybe I'm getting a back feed or maybe a poor ground somewhere? 

One more thing, in the Osborn electrical manual it says there is a black/red wire going to the light in the shift indicator?  My automatic shifter assembly hasn't been touched and the wire is blue/red like all other dash lights. 

[J_Speegle]

Okay, finally got to work on it again.  I checked and didn't have the passenger's side door switch circuit completely hooked up.  Once I did that, the passenger side sail panel light works.  I still have the fuse issue though.  With the key off (left in ignition), driver's door open, buzzer buzzing, interior lights lit up, and I turn the light switch ON it blows the courtesy light fuse which kills the interior lights and the buzzer.  Then with same scenario except the driver's door closed the fuse does not blow.  Any ideas? I didn't take this car apart and don't have any prior experience with this system. One thing that is bothering me is a connection that I had made when assembling the harness.  Towards the center of the dash there is a blue w/red stripe wire and a black wire going into 1 connector.  I plugged that into a black wire coming off one of the connectors for the lights "ON" indicator relay that is right under the buzzer. On these two connectors one is black the other is white, but they are the only ones that are 'mates'.   When I unplugged that connection, opened the door, key off (key left in ignition), and turned the lights on the fuse didn't blow, the buzzer buzzed and the interior lights came on.  But the light for the shift indicator wasn't lighting up (although I don't know if it was before I unplugged the connection either).  I traced the blue/red wire w/ black wire connector to the transmission shift indicator light.   

I'll leave this one to the electrical guys here  - its not me

Also at times, when working around the buzzer and the relay, with the key out of the ignition and the driver's door open the buzzer would start buzzing slightly.  If I pushed the driver's door switch in it would stop even and when I let go of the door switch it would continue to be off and occasionally would start slightly buzzing again when I touched the buzzer or relay below it.  That makes me think I maybe I'm getting a back feed or maybe a poor ground somewhere? 

I vote for a poor ground - the most common culprit in this electrical in cars

One more thing, in the Osborn electrical manual it says there is a black/red wire going to the light in the shift indicator?  My automatic shifter assembly hasn't been touched and the wire is blue/red like all other dash lights.

Possibly the color code changed earlier in the year (one of the possible reasons that particular sheet was printed), changed later or the manual was incorrect at the time the page was printed an possibly caught later. All kinds of possibilities when it comes to the Assembly Manuals

[midlife]

Towards the center of the dash there is a blue w/red stripe wire and a black wire going into 1 connector.  I plugged that into a black wire coming off one of the connectors for the lights "ON" indicator relay that is right under the buzzer. On these two connectors one is black the other is white, but they are the only ones that are 'mates'.

This makes no sense.  Blue/red and a black wire going into a single plug/pin?  or a 2 pin plug?  In either case, I know of no 1970 underdash harness plug that has that configuration.  Nevertheless, I believe this is the source of your problem.  Typically, blue/red is a dash lamp or headlight-controlled light, and black is ground.  Ford always strove to make wire colors match across plugs, and even had most mating plugs the same color.

[shelbyboss302]

This might help you out. Follow wire colors until you find problem wire. The Convenience Group harness is a different animal altogether than standard harness.This was about as much of a pain to post as your wiring problem so I hope it helps!

                                         Shelby
                                   

[70Mach]

Got it!!!  YES!!! The color coded diagram is what helped me figure it out.  On the buzzer there are 4 terminals for two connectors, each having a black and red wire.  The red wires were diagonal from each other and when reading the Osborn Electrical quickly it would appear that is the correct way.  The connectors are made so they only fit one way.  One of the connectors is from the original Convenience Group harness, the other is on the new main harness.  The connector on the new harness had the red and black wires installed so they were diagonal from the wires on the other connector.   The color coded diagram shows the red wires on one end of the buzzer and the black wires on the other.  I pulled the wires out of the new harness connector, switched them around and everything works as it should!  When comparing to the old main harness, it confirmed the wires were switched in the new harness connector for the buzzer.  The picture is of the old harness connector.

This is the way it works now: Ignition switch OFF, key in, driver's door open - buzzer works, take the key out - buzzer stops.  Then with: ignition switch OFF, key in, driver's door open, lights ON - buzzer works, take key out - buzzer continues until the light switch is turned OFF.  In either situation the buzzer remains off when the door is closed. 

As far as the two wires (blue/red and a black) hooked together into a single terminal, both the old harness and new harness have it.  It connects to a black wire that goes to the relay below the buzzer.  The other black wire coming out of that relay goes to the buzzer.  The blue/red wire goes to the shift indicator bulb.  The black wire goes to the headlight switch.  I've attached pictures to give you a better idea of what I'm talking about.  I untaped the old harness to find where those two wires go to.

I had a ground problem on the shifter housing for the indicator light.  Fixed the ground problem and the light works.

Thanks for the assistance!

[midlife]

Ahhh...that single pin connector!  I've always wondered what it was for.  It is tied to the PRNDL and marker lamp system, but I never knew what is was to be plugged in.  That must be the signal to the buzzer relay that tells it that the headlights are on.  BINGO!

Sorry about the confusion. I simply did not recognize that you were talking about that unusual single-pin connector.  Shame on me.

[70Mach]

Ya, that is an odd combo going into a single connector.  And probably not a connector that is used very often.

[rayms69]

holy crap, that was an original connector, I thought it was some aftermarket bs. the black tied to the blue/red. I don't think my car has any buzzers, so the black goes to what then, if no buzzer? Do you have a sportlamp switch and if so how is it connected? the black is powered from headlamp switch mid? powers PRNDL light and to the black wire on sportlamp switch, with the only output from sportlamp switch, the grey to lights, black with yellow is not used,

[midlife]

holy crap, that was an original connector, I thought it was some aftermarket bs. the black tied to the blue/red. I don't think my car has any buzzers, so the black goes to what then, if no buzzer? Do you have a sportlamp switch and if so how is it connected? the black is powered from headlamp switch mid? powers PRNDL light and to the black wire on sportlamp switch, with the only output from sportlamp switch, the grey to lights, black with yellow is not used,

Many times, the actual PRNDL wire is blue/red.  The black wire on the two (sometimes three) prong plug that plugs into the relay goes back to the turn signal connector.

Now as for the sportslamp switch, yes power comes in through the same system that gets power from the headlights and powers the PRNDL lamp and outputs a gray wire to the sportslamp via the firewall connector.  I've never seen a yellow wire on that connector, however.  BTW, that connector is unique to 1970 Mustangs.  Similar connectors are found in Cougars and other applications, but they are not the same.  Makes my life hell having to adjust other connectors to fit the 70 Mustang.

[rayms69]

wish I wouldn't have cut it, but at least I know it was correct. I have lights and sportlamps work with the connections u suggested. Im still blowing the fuse when turn signals actuate, but my front signal lights aren't installed and driver door light is not connected, so probably not grounded properly. Thanks for those pics, I have been waiting awhile for that particular connector pic, now just need sportlamp switch and wiring pics and that area with the dash pad removed. I still don't know why that black with yellow is there for the connecting from sportlamps switch to harness

[70Mach]

Is this what you're looking for?

[midlife]

Is this what you're looking for?

That's the 70 sportslamp connector: rare as hen's teeth!  It's a unique connector for Mustang and only that year.  I've seen maybe 6 out of 100 1970 harnesses so far.

When folks want to add sportslamps to their car, I have to use a Cougar connector and modify it; even still, it doesn't have the clips to hold it into the switch.

[rayms69]

Yes 70mach, do you any more pics that show how/where those wires look, there is an original on eBay right now midlife, I almost bought it just because

[70Mach]

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.