I bought this 122 from a friend about 4 years ago. About six mounths ago I got serious about the restore. Now I hit a road block. the headlights won't work. there are wires under the hood that look like they may have gone to a relay. but they were taped to the harness and look like for a while . Does any one know if I need a relay?

 

sorry! I started with a tech question. I am new to the forum I own a 1966 122s I thought I might find some help here. I have always worked on U.S. built cars and trucks. These are a little bit different.

 

Just curious what fascinated you about the 1966 Volvo 122...?

Now about the relay, note that the headlights will consume 110 watts in normal and may be as much as 330 watts when combined with the high beam of 60 watts each, so a proper way ...[I don't care who did what then in 1966], to deal with this is :

You must use a relay [30Amp-12v ]which takes 12 v low current input to a coil, and this input has tobe wired via the switch on the dash board, to the igniton if you want the lights to come on ignition only.
The relay output[30 A] has to be wired thru two fuses , for two circuits, one going for low beam both lights and the second circuit going to the high beam...combined for the pair.
You can also wire one side[both high and low beam], via one fuse/circuit, and second via second s
circuit.
Both circuits are connected to the one relay out put of 30A positive...coming from the battery....to the relay. Also its your option to use the ground..for the negative of the light heads or rather have a clean negative going to the battery negative.

I am a ME but did assemble the tube type radio and transmitters back in 70's...so know a little about electrons...!

Good luck..
going to jn

 

I m sorry I missed the fact that each circuit[of low beam, and high beam], has to be separate and wired thru separate relays[2]..and each relay hasto have its own input from dash...for low beam and high beam.
That means the two low beams will be on one circuit, and independent relay and second circuit with second relay will serve the high beam.