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Those are good suggestions by minorl. I would also check the connection to the 4th gear switch at the right front corner of the gearbox cover plate. Before any of that you could take a look at fuse 11 and see if it's loose or corroded. Squeeze the prongs in a little, clean the fuse ends and apply a little dielectric grease.
You can also check the multi prong receptacle to the OD relay which is buried somewhere under the dash but it's not too hard to find.
Visual inspection is one thing but you can also check for loose fit and I would actually jostle the wires. For this you would want the ignition on by which I mean turn the key to the position II. This can fuse your points and damage the coil if it goes on to long so I would put a stiff piece of paper or a flat wooden toothpick or a scrap of rubber innertube or something non-conductive between the contacts. Don't forget to remove it later. If jostling causes the OD to cut out you have found the culprit.
With ignition on and car in fourth gear press the OD button. and make sure the indicator light displays. Then start checking those connections. For solenoid and 4th gear switch you will need to get under the car so please take all due safety precautions including using jack stands and chocking one of the rear wheels.
So if none of this isolates the problem and it keeps occurring it may be the relay itself or it may be a hydraulic issue, most likely at the solenoid. This would probably be a matter of replacing the seals which I think you can still buy. Years ago I found that the seals were bad in the M46 I was transplanting into my 1980 242. The solenoid was actually filled with transmission fluid. It was simply a matter of draining the solenoid and replacing the seals.
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'79 242, '84 DL 2 door, '80 DL 2 door, '89 DL Wagon, '15 XC70 T6 AWD
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