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Back to the icy mornings and the memory of a mod I did for my Spring Special Boris. Roy McBrides blog over at The Imp Club Limited Official Forums mentioned it and I realised I had not made a note of it myself
So here is a mod I did on the wiper motor to add a fuse and relay control to the wiper motor.
Why ?
Well I heard a crack from the wiper switch one morning which sounded like an arc, was working OK and only did it once but I did not like it, when checking current draw, no resistance, that little beggar can draw 7.5A and although those switches are rated higher, thats only when new !
Why be paranoid, well the horns and heater blowers draw nearly as much current and the fires they have started are well known !
Thats a lot of power for a "loom heater" if that motor jams while not finished its cycle to home, although the wiper switch element inside on its own would likely fuse, but fuse to where
Plus the motor is switched ground, that means the motor is powered all the time and the switch to ground is only to START the motor, the limit switch takes over autonomy after that so adding all that up in my head equated to a self contained hazard in the making on 50+ year old wiring.
You dont need to cut any wires up, only make a few crimped ends and it all plugs together.
In the end the wiper switch will control the GND return for a relay (some 0.15A) rather than 7.5A and all fused.
Motor wires are simple and are as per the wiring diagram. Below is wiring diagram and locations for an original car.
What we will be doing with the mod is this
The wiper switch "load" is now taken up by the relay at the point it is required and all this can be acomplished with spade connectors. Mounting the relay is dealers choice
References for relays
You could of course do a short version and just add the fuse, I added 8 of these in the car, all inline as protection (another story for another day)
Everything can be prepped inside, especially in the cold, ready to fit
This was it installed, just needed secured
And of course, I cannot claim all the credit as the "BOSS" was supervising
So here is a mod I did on the wiper motor to add a fuse and relay control to the wiper motor.
Why ?
Well I heard a crack from the wiper switch one morning which sounded like an arc, was working OK and only did it once but I did not like it, when checking current draw, no resistance, that little beggar can draw 7.5A and although those switches are rated higher, thats only when new !
Why be paranoid, well the horns and heater blowers draw nearly as much current and the fires they have started are well known !
Thats a lot of power for a "loom heater" if that motor jams while not finished its cycle to home, although the wiper switch element inside on its own would likely fuse, but fuse to where
Plus the motor is switched ground, that means the motor is powered all the time and the switch to ground is only to START the motor, the limit switch takes over autonomy after that so adding all that up in my head equated to a self contained hazard in the making on 50+ year old wiring.
You dont need to cut any wires up, only make a few crimped ends and it all plugs together.
In the end the wiper switch will control the GND return for a relay (some 0.15A) rather than 7.5A and all fused.
Motor wires are simple and are as per the wiring diagram. Below is wiring diagram and locations for an original car.
What we will be doing with the mod is this
The wiper switch "load" is now taken up by the relay at the point it is required and all this can be acomplished with spade connectors. Mounting the relay is dealers choice
References for relays
You could of course do a short version and just add the fuse, I added 8 of these in the car, all inline as protection (another story for another day)
Everything can be prepped inside, especially in the cold, ready to fit
This was it installed, just needed secured
And of course, I cannot claim all the credit as the "BOSS" was supervising
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