This morning it came to me that you are referring to switch with Cruise Control wiring, while my no-help reply was addressing the "light control" wires (not all switches are wired for cruise control).

After digging in the Bentley manual, I think your ebay seller was wrong. Those wire colors go to a round white 4-pin connector—which leads to the Cruise "brain". The problem is that the post '90 brain is not the same as the earlier one, and the terminal numbers don't match.

In fact, in the early system, all 4 switch wires go to the brain terminals (2, 3, 11, and 12), while in your later system, only 3 switch wires go to the (later) brain terminals (1, 2, and 6), with the 4th wire (blue) going to fuse #12.

I see no way you can use the earlier switch. The one you need is PN 3523536. OE price is $98 at Tasca Volvo, $119 at FCP Groton.

--
Bruce Young
'93 940-NA (current), 240s (one V8), 140s, 122s, since '63.

Perhaps someone has done this before. That in itself is a good bet given the wide audience of the internet. Perhaps you are right, but so far, your help has only come from someone who hasn't done it before, but has the time on his hands to do your research for you.

Some confusion here. The Bentley diagrams (Volvo copies) show a slight difference pre and post 1990, but your wire color descriptions don't match either one. FWIW, here's what the diagrams show:

EARLY==> Terminal <==LATER

Brown====>31b<======Brown
Green=====>L<=======Blue/Green
Yellow====>49a<======Yellow
Blue======>R<=======Blue

I have the early switch and one (presumably) later. While the terminals are configured slightly differently, they are in the same relationship to each other on both switches, as below:

Viewed from the back, with the stalk pointing up:

Alone at the upper left is 31b
then
L (left), 49a (power in), R (right) from left to right


--
Bruce Young
'93 940-NA (current), 240s (one V8), 140s, 122s, since '63.