Long story short I'm attempting to hook up the Overdrive on my 122 (with a retrofitted M-41) using the relay/setup out of a '81-'87 240 with a M-46.

The reason for doing this vs doing it with a relay out of a volvo of the same vintage (122, 1800, etc) is because I like the idea of the OD turning it self completely off when shifted out of 4th gear.

I think I have everything hooked up correctly, but for some reason I can not get the M-46 relay to work.

I'm hoping a 240 M-46 guru can help me understand just exactly how the relay hooks up on these cars. (My '80 and '79 240s both have m-46s, but being the early style, they don't have the momentary contact relay.)

At the moment I have it hooked up as follows:

OD Solenoid to pin 87 on OD relay, OD light also hooks up to pin 87.

One end of the 4th gear switch hooks up to pin 85 on the OD relay, the other end of the 4th gear switch is grounded.

+12 volts from the fuse box (when Ignition is on) is connected to pin 15 on the OD relay.

The OD switch (momentary contact style) connects to pins 15 and 86 on the OD relay.


Is there something I'm missing here? Is this hooked up incorrectly?

Thanks as always!
--
Formerly 'HearToTemptYou'

You should be able to figure out what is what from the following:

Wire colors for 81 on 240 series Laycock OD relay system socket.

RELAY:
15-double blue, one wire from fuse, the other to the shifter switch
31-black to chassis ground
86-brown, from shifter switch
87-double yellow, relay out to solenoid and dash light
85-red, relay to 4th gear switch on tranny for relay coil ground

On right side of tunnel under carpet:
(yellow & red go thru BLUE connector, then to 4th gear switch and solenoid)
(brown & one blue go thru BLACK connector to shifter switch)

OD SWITCH:
blue from relay 15
brown to relay 86

SOLENOID:
yellow from relay 87
yellow to under rear case bolt.

4th GEAR SWITCH:
red from relay 85

DASH LIGHT:
yellow from relay 87

Duane

I cut-pasted, then read the other replies.

If no relay action, test 12 volts present between 15 and a chassis point NOT 31, then to 31's point. Then test with power off for continuity between 15 and 86 with the switch closed.

Your 4th gear switch is probably not closing. You should have zero ohms when in 4th gear between 85 and any metal chassis point. Pulling shifter back and to the right sometimes makes contact if 4th gear switch is not too far gone.

Duane

Hello,

Did you forget to ground pin 31?
--
Eric
Hi Performance Automotive Service (formerly OVO or Old Volvos Only)
Torrance, CA 90501

Pin 31 is grounded, I forgot to mention it in my post above.
--
Formerly 'HearToTemptYou'

Hello,

If your relay is used, it might be bad.

I have changed more than one of these relays.
--
Eric
Hi Performance Automotive Service (formerly OVO or Old Volvos Only)
Torrance, CA 90501