Nice wagon, and welcome to the forum! The turn signals and flashers run off the same relay. Which is hidden under the wood trim on the center console. I'd take the relay out and clean the plug and prongs. To get the wood center console off, you have to remove the ashtray. Then remove the two screws that hold the metal ashtray bracket in. This will release the front edge of the console. Then pull the whole wood piece towards the rear of the car. Then it will come loose and you can look around under neath for the relay. I believe it's in front of the gear selector. Don't just pull up on the rear of the wood trim. There is a plastic clip that will break off if you do and it will never go back in completely. If it's not that it could be the combo switch on the steering column. Might get lucky and have a loose wire.

Also have read through the link below. Your ways has a rear Self-Leveling-System. Which keeps the rear at proper ride height, when you load it down with stuff. The system is great and works really well, but some of the parts can be expensive to replace. Fortunately the expensive parts aren't often what need replacing.
Self-Leveling-System - How it works, and troubleshooting the system

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