Leaderboard

Some have pinged me for more details so adding below.. Basically you de-solder that 200K ohm stock resistor on back of the wiper relay, run two wires from those points out to your wiper stalk and hook them up to, one outside terminal, and one to the pot middle terminal, of your 500K ohm pot. There's a pic that shows the pot part number that I used. Then you will need to experiment to find the max ohm setting you can use. What happens is the wiper won't park and just keep running (i.e. not intermittent), if it's too many ohms. You'll need to note that ohm value where that threshold is, and then setup your particular circuit so the max ohm setting is a bit less than that max value. From my experiments on two cars, that max ohm correlates to about 16 to 17 seconds, between wipes. Remember, the goal is to get it to wipe once, then park, until the next cycle. If your ohm setting is too high, it won't park. If you find your max ohms is less than 500K, then you can add a shunt resistor (back in the stock R location on the wiper relay) to make your max ohms what you need (google how to calc parallel resistor networks if you're not familiar). If you need more than 500K, then just add necessary resistor value into one of the wires. Note this is RC tuning circuit so any currents will be very low; i.e. 1/4 or even 1/8 watt resistors and pots will be fine. Same w/wires; they can be small gauge, but use stranded (not solid copper) wires. I twisted the wires together (to make them twisted pair) running from the wiper relay to the stalk, to hopefully add some noise immunity. Biggest pain is finding a good route through the steering column so it doesn't snag on anything that moves; remember, not only have the turning steering wheel shaft, but also note column telescopes too. I did this mod on our two P80s (96 850 and 98 S70) but looks like the same wiper relay is used through 2000 MY, so should work for those too. https://www.ipdusa.com/products/9792/Intermittent-Wiper-Relay-P80-850-S70-V70-C70-960-for-Volvo-Aftermarket-171452-9140663-121164?gclid=EAIaIQobChMI676Q5o-s_AIVxODICh2vAwjqEAQYASABEgLWWfD_BwE Hopefully that's all clear? Ping me if you have any other questions.