I've been reading the posting for gear shifters and nothing looks about right. I want to check the overdrive switch on the shifter, but haven't figured out the proper method for this automatic. Hayes has a detailed explanation for
a manual shifter but not an automatic. Anyone with experience out there
willing to share your experiences?

I've read about springs being lost and short wires that are hard to reconnect.
Should I cut my losses now and head to the dealer or just re-wire the solonid
directly?

Thanks

This is assuming that your 1991 circuit is the same as my 1988 240.

Randy's suggestion is a good one. I would do it a different way.

Pull the kick panel on the right side of the center controls, and see if you can find a 3-wire connector close to the shifter well under the carpet. Two green wires, one white.

The two green wires go to the switch. Disconnect the connector, and use an ohmeter and see if there is continuity between the two green wires when the switch is pushed. Do be sure to test the connector headed to the shifter.

BTW the best wiring diagrams are in the Volvo Service Manuals. See if you can get the one for your car. It's worth the money.

Good Luck,

Bob

:>)

I am away from my Bentley's right now but one of the wires (and only one) will supply a momentary 12v to the relay when the overdrive switch on the shifter is depressed. You can simply put a test light on each wire in turn and depress the overdrive switch and watch for the test light to light with the button pressed in (you need to provide a good ground for the light). If you can't get the light to come on with the button depressed you need to explore the reasons why. If the light does come on with the button depressed you have correct function of the switch.

Randy