75 914/4

Car did have A/C so I'm not sure what I'm looking at.

Anyway, there is a socket in the photo that seems to be missing either a relay, or something similar. It has female spade connectors waiting for a mate, but I have no idea what goes there.

Also, notice the four loose wires. (Yellow, red/white, white, yellow/red).

I "think" the yellow plugs into the only open spot on the fuse box (not sure that's what you call it, but that's what I call it).

I'm clueless where the others go - and if I'm correct about the yellow plugging into the fuse box / panel??

Thanks,

Len

Click to view attachment

relay for fresh air fan

All four wires are for the headlight dimmer relay, which has an aluminum cube relay case. Your relay has been removed.

The rubber relay socket is for the turnsignal/flasher relay, which is also missing in the photo.

Red/white is always switched power. The thick yellow and thick white wires seem like headlight high/low beam. The thinner yellow/red wire looks from the electrical diagram to control the high/low beam relay function.

Yup, those four wires should be connected to your headlight high/low beam relay.

The wires going to the relay socket appear to be:
Red, blue, blue/white, brown.

The closest thing I see on the diagram is for the flasher relay: Red, brown, blue/white, and black/green/white. You may be missing the flasher.

--DD