Okay so I'm in the final stages of starting my 74 up for the first time and I'm installing a new engine harness and forward lamp harness (precious owner hacked them both to bits). There are a few connectors in the forward lamp harness that I can't figure out where they attach to. I have a wiring diagram but these don't seem to be on it anywhere? One is a 2 prong connector with 1 black and 1 tan wire coming out and it is tied in right by the dark green wire for the horn. I also have 2 connectors (1 for each side of the car) that have 1 black and 1 white/green wire. The previous owner installed some ****** version of the Monza lights and cut these connectors out. I assume they have something to do with the flip up lights but I would think that would be on the diagram somewhere. Lastly there is a small ground on the driver side that I cannot find a good place for. I was going to put it up on that metal section that the harness clips into but it's literally all rotten away. Anyone have any suggestions as to where I could ground it? The rad support bolts and horn bolts are too big for the eyelet btw. I have pictures but for some reason the app I'm using won't allow me to post them.

 

On the 74 is there a red dash light for when the headlights arent fully up? On my 69 it is activated by a switch on the headlight mechanism and the plug with the black boot looks like the connector for the switch. Link to switch below

http://www.ecklerscorvette.com/corve...1969-1982.html

 

I'm not sure if there is supposed to be a light or not on a 74 but I certainly don't have one. The black and green/white connector definitely looks like it would plug into that switch though. Is there 1 per headlight or just 1 for the car?

 

One per headlight. If they are not connected, the warning light will not come on. If you want to see if the warning light is there, and working, you can simply run a wire between the two prongs on one of the connectors, and then turn on the headlights, and see if a warning light comes on in the center guage cluster.

The purpose of the warning light is to indicate that the headlights were not fulling up in the locked position. If they didn't lock, and were being held up only by engine vacuum, they could go down unexpectedly if the engine was to stall for some reason.

 

That makes sense and it also explains why I have nothing to connect these wires to. Just to clarify, in order to test that light I connect the two prongs of 1 connector together? Where on the dash would this light be? I would like to check it out this weekend when the rest of my wiring is complete

 

The tan and black goes to the cowl door in the hood.

 

There is no cowl door on my hood so I guess that will be left disconnected. Thanks for the clarifications guys, it's much appreciated

 

Yes, connect the two prongs on one of the switches. The switch, when the headlight is completely up and locked (or shorted as in your test), completes the circuit, and the light comes on. On my 72, the headlight warnling light is on the right hand side, next to the door ajar light.

 

The ground wire you mentioned was attached to the radiator core support in my 74...driver's side at the bottom...a bear to get to. I am not certain that the location may not be important for grounding of the radiator core support. I also concur with '75 regarding the tan and black connector, it does go to the cowl door on the hood. Mine was disconnected, so not sure if the cowl door works or not at the moment.

John

 

Thank you for that explanation. I'm curious now so I'll try it on Sunday when the car is running


Was it attached between the core support and the fiberglass for the body? I tried those screws and they are too big for the eyelet but perhaps I am thinking of a different location than you. Also do you know what the ground is for? If it's for those headlight switches or the cowl then I don't even need to worry about it

 

After getting through some more wiring I have come across another roadblock. It appears the "brand new" harness I bought from a member here isn't actually brand new. There is an orange wire cut in the engine harness. The orange wire leads back towards the car and becomes a black wire. Can anyone identify this wire?

 

The forward lamp harness grounds on the metal radiator support using a sheet metal screw and a lock washer. Callout #2 is the lock washer.


What you're holding in your pic may be a fusable link.

 

Thanks for your input mike. That fuseable link is coming from the engine harness, where would it go if it wasn't cut?

 

The orange turning to black is a fusible link feeding the black wire. The black wire is likely one of 2 wires that feed the ammeter. You should find another one similar but black with a white stripe. The ammeter wires went to the horn relay and I believe to a splice somewhere on the firewall. I've only seen pictures of it and it's been a while, but I recall the other wire being spliced into the power wire going from the horn relay to the starter solenoid.

 

So in other words I don't need it to get the car running? If that's the case then **** it, I don't have a horn or anything else anymore really lol.

 

Sorry to bump this but I would really love to finish this car tomorrow and get some pics/vids up!

 

Look on page 2 of the attached wiring diagram. The orange wire to black is a fusable link to the horn relay.

 

If that wire is solid black then it goes to the splice and was probably ripped loose. I guess you don't have the ammeter anymore? Trace the red wire coming from the starter solenoid and find the splice were that fusible link was attached and make sure there isn't any exposed wire that could short. Also, if you're not connecting that wire then disconnect the other orange fusible link at the horn relay.

 

I'm not seeing any wiring diagram? Perhaps it is because I am using the app to view the forums

I have the ammeter but the car doesn't run so I haven't check to see if any gauges are working.

The wire is black with a white stripe. I am going to see if anything near the starter solenoid is exposed. If it indeed got yanked loose I can just add some wire and solder it in

 

Quick wiring question

Turns out not so quick after all.