As with anything electrical dissconnect the battery before doing as below.

If you have visited this page in the past you will notice that the information is completely different. When I first designed the fitting of the Wiper Time Delay it looks like I had Old Age brain fade. I made the design far to complicated. This is a better design and hopefully easier to do. The design is based on a Kit obtainable from Maplins only because I had one handy. I have shown the Circuit so it will be possible if you have the knowledge to make one yourself.

The instructions that came with the kit can be see by a right click here (PDF) and "saving as"

The actual one as supplied by Maplins requires a different Relay. The relay as fitted only has contacts that are N/O (Normally open) and N/C (Normally Closed). This is not suitable as the type of Relay required requires separate and independent contacts. One set of contacts should be N/O (Normally open) and the other set of contacts should be N/C (Normally closed). Make sure that the Relay Coil is sutable for 12 volts D.C.

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The principle is the Wiper Switch as fitted to the Scimitar SE5a requires the bottom two contacts to be made when the wipers are switched off. This is required to make the Wipers park at the end of their wipe. When the Timer is in operation the Relay is energised, this disconnects the bottom two contacts of the Dash Switch and applies voltage to the Fast Wipe contact of the dash Switch. After a preset time (adjustable) the Relay returns to the off position removing the Voltage from the Fast wipe contact and connecting the two bottom contacts of the Dash Switch allowing the Wipers to park. Adjustment of RV1 gives the delay between wipes. Note that RV1 is removed from the PCB and replaced by a control that can be adjusted by the driver. This control can be fitted wherever you want, I fitted mine just below the Dashboard on the side panel. This control can be whatever you find convenient. a 1MOhm pot will give approximately a 60 second delay or a 500 kOhm pot will give approximately a 30 delay. I found that having a pot for control was OK but I needed to take a bit of a guess how much delay I had adjusted to. My solution was to fit a mutiposition switch (5 way) that had 100kOhm resistors. This allowed 5 positions for delay, each 100kOhm resistor giving approximately 6 seconds so position 1 gave about 6 seconds between wipes and position 5 gave about 30 seconds between wipes. If when you connect the pot or switch the delay is the wrong way around (maximum delay to minimum delay) just reverse the two wires going to the PCB. Using the values of resistors or pots that I have given it is not difficult to calculate different delay times to suit what you would like. The values I have given are what suits me. The other adjustment on the PCB is RV2 (Pulse). This is the time that the Relay stays on. If it is set for to short a time the Relay could switch off before the wipers have started to wipe. If the delay is set to long the Relay will stay on allowing the Wipers to make two or more strokes before stopping. To set this control switch the Timer delay circuit on and adjust the control so as to allow the Wipers to move across the windscreen and half way back. You will hear the Relay click as it switches on and off. When making this adjustment it is a good idea to move the Wipers away from the screen to avoid scratching the glass.

The normal operation of the Dash Wiper Switch is shown below.

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The connections for Timer are made from this switch (except for the earth, connect this to a known good earth point). The principle is the 12 volts from position 5 on the switch is connected to 5 on the Timer PCB and to 2 on the relay (It may be a good idea to print both the new circuit and Dash Switch connections, these are shown below). By using the voltage from the Wiper Switch means that the timer can only operate when the Ignition is switched on. All existing wires on the Dash Switch remain in place except for one, see below.

The 12 volt connection to the Timer from the Dash Switch will need to be switched on and off (You do not want the Timer to be operating all of the time). If you are using a Pot you can get one with a Switch. Make sure that the switch contacts are up to the job, capable of switching 10 amps will be OK. If you are using a mutiposition switch you can get one with separate contacts for this switching, remember to make sure the contacts are capable of 10 amps. Connect Relay contact 5 to 5 on the Dash Switch. Remove the wire from 3/4 on the Dash Switch and extend it to Relay contact 3 then take a wire from Relay contact 4 and connect it to the Dash Switch terminal that you removed the wire from. This is the only connection on the Dash Switch that you actually remove one of the wires. Connection number 1 on the Relay goes to 5 on the Dash Switch.

All should now be OK. adjustment of the RV2 pulse control on the PCB is explained above. Wires used should be capable of the current (Amps) required by the Wiper Motor (Look at the existing wires as a guide), if the wire is to thin and unable to take the current required there is a risk of them overheating, and the Relay contacts should also up to the job (10 amps).

Now all you need to do is to reconnect the battery and enjoy Intermittant Wipers. So much better that having to click the Dash Switch on and off.

I hope you found this of use and it is fully adjustable.

Don Kennedy.