Would you want a wiper delay harness? Options

[JeffBowlsby]

My thanks to Ralph Gosnell, he let me borrow an original factory wiper interval wiper relay harness. I have since done some initial research and it looks like I could make these available, with a new relay.

I could make the harness available in the $40.-50. range, and the relay is available at cost for about $65.

The harness would come with detailed pictorial installation instructions and the wires would be correctly color coded. It would take careful scrutiny to see the difference from my harness and an authentic factory harness.

Please respond to this post if you would be interested in getting one of these harnesses. I suspect I would just provide the harness and tell you how/where to obtain the relay. Your response is not a committment to buy, I am just gauging interest to see if I should develop this idea further and order parts.

Thanks! Jeff

[JWest]

i actually tested it for that said function before i assembled the unit.
however, the unit i have did not have an extra position below the OFF.
i could not move the lever down and i did not get any movement on the wipers.

how can there be 2 completely different "modes" if there's only ONE control wire from the lever to the relay ???
if you take the assembly off the steering column, you can actually see the switch closing on the opposit site.

still confused,  :confused:
Andy

OK, well I'm confused to. I never looked at the diagram or the wiring, I can only tell you what my (1974) car does. I know it does the delay, I just used it today.

Maybe there are two versions of switch/relay? (IMG:style_emoticons/default/confused24.gif)

[davep]

It may be that there are two different relays, one for each function. Please check the relay part numbers.

DaveP

[JWest]

I'll see if I can get the number off mine tonight, and I'll check the washer functionality.

[JFJ914]

I have 111 955 531 w/a 11/71 build date from the donor '74. It's the S1 contact thats missing from my original '74 non appearance group car.

[fiid]

I would like to know what the internal wiring of this relay looks like too - I am interested in building (and selling) a small circuit that replaces it and provides variable speed for intermittent wipe.

And why don't my wipers return when I turn them off?

Fiid.

[Air_Cooled_Nut]

Not sure if this is the same or what since there seems to be some confusion but I'll add it anyway. Here is how to add an intermittant wiper relay to the VW Type III (air-cooled stationwagons). The wiring colors/routing should be consistant between VW and Porsche so route wires accordingly. For experienced electrical users only. Batteries not included. Don't ask me for help cuz I've never done this to any car. Don't run with live grenades. Perform at your own risk.

At the bottom:
http://www.icbm.org/erkson/ttt/windshield_...tem.html#custom

[Rouser]

I could definately go with intermittant wipers ... bring the harness on.

[JWest]

OK, I just got in from the garage.

1974 2.0 has relay part #111 955 531.

When I pull the lever for the washer, the wipers traverse twice (wipe/wash function).

When I push the lever down, the wipers traverse every 5 seconds (delay function).

I also have a relay from a 1976 and that is also #111 955 531.

[seanery]

now that I think of it, my 74 has the same functionality as James'

[SirAndy]

ok, so the difference is in the relay AND the switch at the column.
(mine doesn't have the DOWN option) ...

interesting (IMG:style_emoticons/default/idea.gif)
Andy

[markb]

a small circuit that replaces it and provides variable speed for intermittent wipe.

I'm thinking of going even simpler than that with a dial from an SC.

[JeffBowlsby]

Thanks for the great responses so far...I will hope to shed a little more light on what I have found...and maybe more confusion.

The Factory Manual calls it a 'wiper interval relay-(optional)', on both the 1972 and 1973 model year schematics. In 1974 they issued a separate 'Additional wiper interval' schematic, dated 1973. There is no similar diagram for the 75 model years and the factory manual does not cover the 1976 model year. I havent studied the schemantics in any detail to see if there are other differences, which I need to do.

I dont know how the wiper interval relay works internally Fiid...but why reinvent the wheel? Its only a paltry $65 for the real deal...

The factory manual has a diagram and instructions for the conversion, dated 1973, at page 4.4-6/1. To me that means the 74 cars would be capable of a direct swap in retrofit. It maybe possible to retrofit a new switch and wiring into an early car, but I dunno...

The relay can be had from PP or apparently anyone with access to Bosch. PN 111 955 531 is apparently the originally specified relay. It has been superceded by PN 477 955 531 according to Darren at PP. He quoted me a price of ~$57. +tax/shipping. The relay has some microelectronics in it...capacitors and a chip I think, not just a typical on-off electromagnet type relay. If I do these harnesses, I'll just do the harness and let you get your own relay....I have no interest in inventorying something you can easily get on your own.

The wiper delay/relay is not an appearacnce group item, it was simply an option...like the rear window defroster.

The harness I have seen only has four wires - Brown, Green/white, Red and Blue/Black. Andy described his install as having 5 wires, which corresponds to the 1974 'Additional wiper interval' schematic, in fact it corresponds to each of the 72-74 schematics. The additional brown/black wire comes out of the main body wiring harness and is attached to the S pole of the relay, which goes to the switch.

In either case the wiper lever arm/switch and/or the steering column housing needs to be modified (a tab removed) so that the multi-positions can be achieved.

Jeff

Edited Feb 26, 5:20 am

[anthony]

The relay can be had from PP or apparently anyone with access to Bosch. PN 111 955 531 is apparently the originally specified relay. It has been superceded by PN 477 955 531 according to Darren at PP. He quoted me a price of ~$57. +tax/shipping.

That's good to know. I thought the factory relay was NLA.


Here's an idea:

Is there any reason why the original relay needs to be used? It seems like designing a harness that uses, for example, a $5-10 relay from the FLAPS would be a great solution.

[JeffBowlsby]

The original relay does appear to be NLA Anthony...thats why there is a substitute relay with a superseded PN.

The relay has some microelectronics in it...capacitors and a chip I think, not just a typical on-off electromagnet type relay

Which is why its not a $5 relay. It looks like a relay but its not a relay at all....its a circuit stuffed into a realy-like box.

[Bleyseng]

Its the same as a 75 and later Bug so go to a VW parts store to find one.

[anthony]

Which is why its not a $5 relay. It looks like a relay but its not a relay at all....its a circuit stuffed into a realy-like box.

Right, but why does that part have to be used? Is there a technical reason? FWIW, JC Whitney sells a intermittant wiper kit for $16.

[partsman]

As I have unequaled access to factory stuff...I work at a dealer, I can tell you all what I've done for my '73 1.7. The factory harness is STILL available, part number 914-612-143-10. According to factory info, any car built after 02/01/72 (basically late '72 or later) should have the wiring you tap into already in the car. I then got a relay, which was originally part number 111-955-531. This has been superceded to a 924 part number...starts with 477-. I also got the wiper column switch out of a '77 924..getting hard to find from the factory, but I think it's available aftermarket. This switch already has the plug out for the interm. postion. I found the wiring under the cowl to tie into, and also the other end, under the column. I remember changing the white plastic wire holder from my switch to the 924 one so it would fit in my column. My car operates as the others have said, and it's a whole new world on the frosty new england mornings.

[JeffBowlsby]

The factory harness is STILL available, part number 914-612-143-10

Thanks for the heads up on this Partsman. I have verified it is available still...this thread is dead. If you want one...get it from your friendly Porsche dealer... (IMG:style_emoticons/default/cool.gif) Glad to know the real ones are still available.

[fiid]

Bollocks. There was a 924 at Pick-n-Pull when I was down there the other day. I didn't even know to look for an intermittent wipe relay otherwise I would have snagged it.

(IMG:style_emoticons/default/headbang.gif)