Newbie Wiring Help!

[Peter Fonda]

Hello all, I'm a proud new owner of a '73 Cuda. Have been busy going through replacing all of the harnesses, front and rear lights were a breeze. Main dash harness seemingly went well, everything looked good, but need a few pointers below, any help would be appreciated! Glad to be part of the group! As a side note, I'm waiting on new Dakota Digital Rally gauges, I currently have most of the gauge wiring unplugged as I currently have a Non-Rallye setup.

1. Turn signals worked before the harness swap, switched to LED bulbs, and also switched out both flashers. Have tried two different directional steering column sets, both do not work (one was the original) yet the ignition light and hazard lights work
2. Put in a new retro stereo, wiring seems correct, but when the radio knob is off, the dash lights and console shifter indicator also don't turn on. When the stereo is on, they also turn on
3. Put in a new under-dash A/C harness, can't figure out where these two connectors go? (blue and green)
4. Coming off the brake light switch, where do this connector run to with two blue wires?
5. horn works, but only when you put the key in the ignition, when you turn the key, horn stops working...

Thanks,

Peter

View attachment 71964

 

[AUSTA]

Here's a link to all the coloured drawings

Colored wiring diagrams - 70 Cuda/Challenger in Electrical & Audio

 

[Peter Fonda]

Thanks for the link. I was able to track down the A/C lines (need to run to the bulkhead) and the brake light switch (connector for cruise control if I had it)

Anyone have any ideas for the turn signal, horn and radio wiring?

 

[AUSTA]

By the look of it the horn comes from the horn to the bulkhead disconnect on a Dark green with a red stripe pin 24 then to the positive output on the horn relay the black wire with strip from the column shorts to ground when the button is pressed .
You could use a relay if is not included positive to 1 contact & relay coil horn to other contact ,other side of relay coil wire to the steering column horn ground when pressed.

 

[AUSTA]

The lights have 2 x flasher cans 1 for the hazard 1 x the indicators black from the flicker can goes to positive then out of the flicker can & connects to Red D2 -18R up to the indicator switch

 

[moparleo]

You might also try standard bulbs in the sockets that the LEDs don't work in. They are not always plug and play. Put a new turn signal switch in whatever column that you use. Make sure to use a high quality switch, OEM if you can find one.
Down load a Factory Service Manual.
MyMopar - Mopar Forums & Information - Service Manuals

 

[fasjac]

You might also try standard bulbs in the sockets that the LEDs don't work in. They are not always plug and play. Put a new turn signal switch in whatever column that you use. Make sure to use a high quality switch, OEM if you can find one.
Down load a Factory Service Manual.
MyMopar - Mopar Forums & Information - Service Manuals

 

[fasjac]

I agree, tried LED in the front park/turn lamps in a C5 vette and bothe sides worked but, on turn signal just blinked way too fast. Like a bulb was out. Put regular bulbs in and it worked fine.

 

[Peter Fonda]

Ok, after a long day of tinkering, everything seems to be working. I had switch to the 11 wire turn signal switch, and the flasher near the ash tray wasn't working. I got fed up and swapped the side marker and tail light bulbs back to regular bulbs after having LEDs in, just glad everything is working!

Thanks for the suggestions

 

[70chall440]

LEDs usually require a load resistor unless specifically designed not to use one. The resistors can be purchased at pretty much any auto parts store, or you can order one from the below link.

LED Light Load Resistor Kit - LED Turn Signal Hyper Flash & Warning Fix | Super Bright LEDs

 

[i_taz]

Incandescence rules...!

 

[gs73rallye]

LEDs are diodes. They have to have proper polarity. If they don't light, try turning them around.