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Thu May 07, 2020 7:52 am

I have recently purchased a NOS SWF washer/wiper system, which I am looking to fit into my 58.

The existing wiper switch has 3 connections

54d Black/Purple wire
54 Twin Black wires
31b Brown wire

The SWF switch/manual pump has 4 connections

54d
54
31
31b

I have connected the new switch as per my logic - leaving the 31 tab unconnected- but the wipers come on instantly, without the ability to shut off. - disconnecting the battery is the only way to turn the wipers off.
Without risking causing problems to the wiper motor - should I connect brown wire to 31 instead of 31b- or am I missing something ?

Thanks

Thu May 07, 2020 1:01 pm

switch...... motor
54...............54...... double jumpered to fusebox
54d.............54d
31b.............31b

According to the schematic, at least.
Make sure the motor body and switch body have earths.

Nicholas

Sat May 09, 2020 12:38 am

Thanks Sputnick,

Just confirming that the 31 tab should be “earthed” ?
The wiper motor only has 3 wires in line with switch so do I need to give this separate earth as well ?

Sorry for all the novice questions- electrics are not my thing.
Cheers

Sat May 09, 2020 5:51 pm

Tall Bloke wrote: Thanks Sputnick,

Just confirming that the 31 tab should be “earthed” ?
The wiper motor only has 3 wires in line with switch so do I need to give this separate earth as well ?

Sorry for all the novice questions- electrics are not my thing.
Cheers
I think because the single speed switches are unavailable you are using a 2 speed switch to run a single speed wiper and that's not a direct substitution. Here's a very thorough article describing the solution you need. In particular it talks about a loop wire between 53 & 53b that gives you two "on" positions instead of off-park / on / dead.

https://web.archive.org/web/20161214025432/http://www.oldvolkshome.com/wiperswitch5866_OVH.pdf

Earthing 31? I think yes.

In this picture from the gallery, it appears already bonded to the wiper case but without the wire earthing / ground is fortuitous and unreliable. The motor is mounted with rubber grommets to isolate vibrations and electrons too.

Nicholas

Sun May 10, 2020 2:23 pm

Success! I ran an earth cable to tab 31 on the switch only and the wipers work
On a single speed as expected. The early wiper motors have a brass earth under the mount so I didn’t run a separate wire.
Thanks Nicolas for tutoring me on this.

Tim