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Intermittent Wipers v1

It's been a while since I installed and wrote about the first incarnation of intermittent wipers for my Herald 13/60, you can refresh your memory here: http://tinyurl.com/zfg8dhe. This kit was getting a bit temperamental, so I needed to consider replacing it with an alternative.

The Maplin kit I used previously was versatile in that it provided variable delays to the sweep of the wipers, but I was too lazy to build another and there was no mistaking it was a big ugly box behind the dash. Nobody could see it, but I knew it was there so decided on a different route this time.

There are several options out there, a similar kit to the Maplin one from http://tinyurl.com/hagnyr7 (cheap, build it yourself kit), or the SmartScreen modules that are now sold by the TSSC Club Shop or direct from the manufacturer at http://tinyurl.com/hecyd2a (fairly pricey, but look good) or a Timer Delay Relay, I chose the latter as they are relatively cheap to buy.

Wiper Timer Relay
Timer Delay Relay

Before I go into detail on how to wire in the Timer Delay Relay, I should mention that 13/60's have single speed wipers and switch to match. I have the correct wiper motor, but my switch is for a two speed motor as single speed ones are no longer available and mine died many years ago, therefore I had a spare position on the switch to use. If you have the single speed switch you'll need to find a way to overcome this.

Apart from the Timer Relay I had everything else in stock, but you can get everything you need from http://www.12voltplanet.co.uk/. Your shopping list needs to contain:

  • Wiper Timer Relay - 5 Sec Delay (P00966)
  • 4 Pin Relay (P00692)
  • Relay Base x 2 (P00708)
  • Blade Terminals with tabs (P00093-10)
  • 11amp Thin Wall Cable for:
    • Earth (Black)
    • Live from Ignition (White)
    • Switch to Wiper Motor

All my live feeds are fused already, but most Herald’s aren’t. Adding fuses to relay feeds is recommended, 10amp will be fine. You should also make yourself aware of how these Lucas Wiper Motors are wired up. They have an ignition fed unswitched live direct to the motor (white), a switched earth through your switch on the dashboard (Black/Green) and another earth for the self parking (Black). The fact these are switched on the negative side and not live is relevant as the Timer Relay can only switch a positive circuit, this is why a standard 4 Pin Relay is also needed as these can switch either way.

The Timer Relay has 5 connections numbered 1-5, but you only need to use 2-5, No.1 is unused. You need to wire as follows:
2. To Wiper Motor Switch on the Dash
3. To Terminal 86 on your 4 Pin Relay
4. 12v Ignition Feed (10amp fused)
5. Earth

The 4 Pin Relay should be wired as follows:
30. Earth
85. Earth
86. From Terminal 3 on Timer Relay
87. To the existing Black/Green wire from the Wiper Switch to Wiper Motor

They say a picture paints a thousand words, so here it is as a diagram 

Wiring Diagram
Wiring Diagram


These timer relays are available with a variety of delay lengths, so if you had a 3 or 4 position switch you could go made and have multiple intermittent settings, but for now this is just fine.


Written by: Darren Groves