Earlier this year L92 Olds brought up about swiching out to a newer flash to pass dimmer in another thread & between everyting else I've been researching I beleive I found the infor needed to do the conversion. First, the switch needed will be from a '94-'96 Fleetwood, '92-'95 Eldorado, '92-'96 Seville, '94-'96 Deville. P/N's from Rock Auto are DS203 (Standard Motor Products) & 1S4833 (WVE), Autozone has UDS423 (Duralast), O'Reilly's also carries DS203, Advance is DSC1098 (Carquest), Napa is DC150 (Echlin). It's also listed for some older models too but the Caddy listings will make it easier to find. From looking at it, it looks like a direct fit with the need to switch the hi & low wires in the pigtail plug. There is a fourth terminal on it which will be for allow a battey hot wire (the orange wire, circuit 40, for the lighter) to allow it to work with out the head lights on from my understanding. L92 Olds may have the correct infor on this. But for those who are good with making their own harnesses there are the four wire pigtails out there new but price & don't have the correct color wire (most likely the wrong gauge too). Hope this info is useful to those who want to update to another modern feature.
If you’re buying a new dimmer switch get one that will allow flash to pass. I made this mod on my car 20 years ago so I don’t remember the application but it was a Cadillac switch that was a direct replacement. I’ve also read that the newer G bodies might have flash to pass? Not sure maybe someone has part numbers to back that up.