[Wgesnerjr]

Yes, it could be adopted for your 70. However your truck lacks some of the systems to make it fully functional. (Seat belt light, key in ignition warning)

But it could be widdled down to the basics for the headlight minder.

First thing is that for your case, a chime module from a 4th gen F-body (Camaro/Fiebird) might be easier to find and wire. It looks like the tan/brown one pictured. P/N 14101255. Make sure it has 7 pins to get the headlight minder option.

I also attached the entire wiring callout, but you would only be concerned in 4 pins. C,D,F,H.

C=12v Battery
D=Parking Lts 12v when on
F=Ground
H=Key on / ignition 12v

Just for reference: there is no A pin.

This will yield you just the headlight alarm. It will only sound with parking lts/headlights on and key off.

Hope this helps,
Jay