The simple modification is detailed in the factory manual, aka Big Green
Book.

There is a removable piece blocking part of the wiper switch.
Remove it, install relay.

Vanagon Bentley
Page 94.4

Mark

Larry Alofs wrote:
> Dave,
>   If your van did not originally have intermittent wipers (with the fixed
> interval), the "99" relay is not a simple plug and play.  I have read
> somewhere about the modifications needed to the parts in the steering
> column and perhaps in the relay socket assy. in that situation.  It's
> probably in the archives...somewhere.  Maybe someone will pipe up with the
> info.
>
> Larry A.
>
>
> On Tue, Aug 25, 2020 at 5:00 PM ddbjorkman@verizon.net <
> ddbjorkman@verizon.net> wrote:
>
>> Gee Larry.  That may be a solution to my problem.  I assume that one's
>> vanagon does not need to have had intermittent wipers as an option when
>> purchased, as mine was not.
>> I'll p-mail you with my info unless I see another post with other
>> information.  Thanks a lot to both you and Mark.  It's always nice to learn
>> something new about these beasts.
>>
>> Dave B.
>>
>>
>> -----Original Message-----
>> From: Larry Alofs <lalofs@gmail.com>
>> To: ddbjorkman@verizon.net <ddbjorkman@verizon.net>
>> Sent: Tue, Aug 25, 2020 11:07 am
>> Subject: Re: adjustable ww delay relay
>>
>> What Mark said.  With the 99 relay there is no pulling to the wash
>> position.  If you can run the wipers in the original, fixed interval delay
>> mode with the original relay, the 99 relay should work fine for you.
>>
>> Larry A.
>>
>>
>> On Tue, Aug 25, 2020 at 8:52 AM ddbjorkman@verizon.net <
>> ddbjorkman@verizon.net> wrote:
>>
>> Thanks Larry and Mark.  Maybe I'm not explaining this well.  Are you
>> saying the relay might have gone bad and not the wiper switch?  I thought
>> the over use of the wiper stalk, caused by often changing wiper interval,
>> is causing the problem, not the relay.  Do those wiper relays ( I believe I
>> have the 198 relay) go bad?  I thought they were pretty reliable.
>>
>> Dave B.
>>
>>
>> -----Original Message-----
>> From: Larry Alofs <lalofs@gmail.com>
>> To: ddbjorkman@verizon.net
>> Sent: Mon, Aug 24, 2020 1:36 pm
>> Subject: adjustable ww delay relay
>>
>> Hey,
>>   I have a bunch of those "99" relays. They let you adjust the interval
>> easily.   They are easily installed on vans that have the fixed delay
>> interval originally.
>> Much harder, but possible on old vans with no intermittent wipers.
>>   If you want a "99" relay, send me your name and address and I'll try to
>> send you one.  The mailing situation is a little difficult here right now.
>> If and when you get it, you can send me some $$.  Not more than $15.
>>
>> Let me know.
>> Larry A.
>>
>>
>