Custom automatic headlight circuit.

PRAVX II S · Feb 6, 2012

So my mate wanted his light to come on in the evening with out him having to touch the headlight switch.
So i made him a automatic headlight module using a phototransistor.
here are some pics.

If electrical minded this project is for you.
See full schematics and full diy information on the following link.

Auto Electrics/Electronics

danbotten · Feb 7, 2012

thats an awesome idea

danbotten · Feb 7, 2012

how much wouuld it cost for you to put 1 together for me?

acarmody · Feb 7, 2012

Very interesting.

A big problem with my VX is the tendency to blow headlight bulbs. My Auto Sparky gave a possible explanation of the bulbs don't like the massive current fluctuations when the starter motor is engaged (or something like that

). This would solve the problem during the day, and will hopefully make the bulbs last longer.

Is there a way to override the module and turn the headlights on even during the day. Like say its pissing down rain, and there is still light out?

Also will you be posting up the resistor and component rating, etc?

PRAVX II S · Feb 7, 2012

acarmody said:
Very interesting.

A big problem with my VX is the tendency to blow headlight bulbs. My Auto Sparky gave a possible explanation of the bulbs don't like the massive current fluctuations when the starter motor is engaged (or something like that ). This would solve the problem during the day, and will hopefully make the bulbs last longer.

Is there a way to override the module and turn the headlights on even during the day. Like say its pissing down rain, and there is still light out?

Also will you be posting up the resistor and component rating, etc?

The module box will give out a earth this is simply taped into the headlight switch wire. Which bypasses the headlight
switch
The factory switch supplies earth to the headlight relay.
So yes you can still use your headlight switch when you want. But you will still have the same problem in this mode.
Sounds like a short of some sort does the fuse blow or just the bulb? What position is the headlight switch when this
happens?

I will put up the component rating soon. just been busy.

yZoH · Feb 7, 2012

The issues with the way you have set it up.

Oncoming headlights might trigger it...

PRAVX II S · Feb 7, 2012

HoZy said:
The issues with the way you have set it up.

Oncoming headlights might trigger it...

Please explain how.
You dont even know were i have mounted the photo transistor?
There is also i thing called sensitivity setting/design.
So this will never happen.

PRAVX II S · Feb 7, 2012

danbotten said:
how much wouuld it cost for you to put 1 together for me?

I will PM you.
Also do you live in nsw?
PM me

PRAVX II S · Feb 7, 2012

Hey guys i just finished installing the module in my mates car.
here are some pics

p

more info on this project on

Auto Electrics/Electronics

acarmody · Feb 7, 2012

PRAVX II S said:
The module box will give out a earth this is simply taped into the headlight switch wire. Which bypasses the headlight
switch
The factory switch supplies earth to the headlight relay.
So yes you can still use your headlight switch when you want. But you will still have the same problem in this mode.
Sounds like a short of some sort does the fuse blow or just the bulb? What position is the headlight switch when this
happens?

I will put up the component rating soon. just been busy.

Just the bulbs, and just one at a time. They still last a few months but still not fun when you buy the better bulbs.

My parents VY executive has light triggered headlights. It always turns the headlights on when I pull into the garage or drive through a tunnel.

So all VYs and up would probably have this, since my folks cars is a just a base model with no options.

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Custom automatic headlight circuit.

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