More information---Spent some time today on the "no tail lights" problem.
I found the 2 fuses under the lip of the left front fender (thanks to Ron). They are both 'hot' when the key is in the 'on' position. They are at the bottom and the top of what appears to be a major junction block. still unable to find the 3rd fuse that Ron mentioned which "could" be the problem. I did remove the fuses (both 30 amp)and cleaned the contact points on the fuse block and the ends of the fuses.
I also discovered the dash lights do not work, and if there is a high/low beam indicator, it does not work. I have cleaned all the bulb contact points and the sockets.
So here is what I have:
Head lights work on both high and low beam.
Dash lights do not work
Stop lights and all turn signals work
the 2 fuses located are good
tail lights do NOT work

JIM

Pull the headlight switch, figure out which connector is tail lights (and front running lights and dash lights)... pull that wire off and apply 12v+ to it directly. You can do that by simply touching the wire to the 12v+ in on the switch.

If the lights come on, you have a bad switch. And it ain't uncommon.

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-Matt I ♥ my ♂

I assume (makes an "ass" out of "u" and "me") that you did scrape or at least inspect the
bulbs and contacts...
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George Downs Bartlesville, Oklahoma

Yes, all the tail light bulbs,sockets and contacts were vigorusly cleaned.

You may have to bite the bullet and get your meter and chase the wires forward (or backward)
till you find that point which has power on one side and doesn't on the other side.
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George Downs Bartlesville, Oklahoma

Hello,

There is a fuse box for a single fuse located forward of the fuse box you have already found.

This fuse box has all the power for all of the running lights and dash illumination lights.

Check this fuse box for power with the headlight switch in the 1st position.

FYI, regarding the fuse box with 2 fuses, only 1 of the 2 fuses are switched, the other fuse has power all of the time.
--
Eric
Hi Performance Automotive Service (formerly OVO or Old Volvos Only)
Torrance, CA 90502