I built and installed an "intermittent wiper" circuit two years ago which is virtually identical to the one proposed by Dave Mason. It's been the best modification I have made on the boat and I use it all the time.
I tweaked some of the resistor values so my delay varies from 1.5 seconds to 60 seconds over the range of the 3/4 turn potentiometer. I used a 4PDT switch because you need one NO (normally open) and one NC (normally closed) switch contacts for each wiper. I used a single timing circuit (like Dave's) however a slight limitation with only one is the intermittent action works on: 1) both wipers at the same time, or 2) only the driver's wiper. In other words I can't have intermittent action on the port wiper without the starboard wiper on as well. In my opinion that's a slight inconvenience and not worthy of building two separate timing circuits.
The cost for parts was about $60-70 with the most expensive parts being the switch, the two relays, and the potentiometer.
The photo of the console show the potentionmeter and the switch. If the switch is "down", the wipers operate as before, when the switch is "up" the timing circuit is active with the delay determined by the position of the potentiometer- works great.
Arrrgh... it's been such a long time since I've posted a photo, I forgot how. I'll add that in a bit along with second photos showing the circut assembly.[/img]
I tweaked some of the resistor values so my delay varies from 1.5 seconds to 60 seconds over the range of the 3/4 turn potentiometer. I used a 4PDT switch because you need one NO (normally open) and one NC (normally closed) switch contacts for each wiper. I used a single timing circuit (like Dave's) however a slight limitation with only one is the intermittent action works on: 1) both wipers at the same time, or 2) only the driver's wiper. In other words I can't have intermittent action on the port wiper without the starboard wiper on as well. In my opinion that's a slight inconvenience and not worthy of building two separate timing circuits.
The cost for parts was about $60-70 with the most expensive parts being the switch, the two relays, and the potentiometer.
The photo of the console show the potentionmeter and the switch. If the switch is "down", the wipers operate as before, when the switch is "up" the timing circuit is active with the delay determined by the position of the potentiometer- works great.
Arrrgh... it's been such a long time since I've posted a photo, I forgot how. I'll add that in a bit along with second photos showing the circut assembly.[/img]
