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I own an old Maruti Suzuki WagonR (2009) which is not having a dome light in passenger area. I want to install a LED light there but can't locate the power cable coming from battery. Since the car is old, I don't have its manual (though I doubt such technical details are mentioned in user's manual) I tried to search on internet for a circuit diagram but can't find one.

Can you please point me in right direction?

P. S. Its having a dome light in driver's area but its not useful for the passengers sitting in second row.

Mudassir
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3 Answers3

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Take the existing light out and test, using a test lamp or multimeter, each of the wires to find the one that is live.

This does assume that the existing lamp is working otherwise you need to check the supply.

Solar Mike
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chrisfix has done a very good video on how to install an auxilary light. youtube link

the only difference is in your case the lights are going to be inside.
basically you need to do these

  1. Find out the wattage of the lamps
  2. Create fusible wire link with proper ohmage calcuated from lamps wattage
  3. Find a way to move your wire from under the hood to inside and its expected length, then buy wire according to that length (I think you might need 1.5mm^2 wire)
  4. Use a relay if your LEDs are of high wattage and thus you can bypass high current flowing over your head.
  5. Create a rough diagram of what you need to do
  6. And last but not the least before doing any modification Disconnect negative terminal of the battery
Nilabja
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On most vehicles, the entire dome light assembly can be removed, or the cover popped off so that the bulb can be changed. You should be able to carefully pop it out and gain access to the light bulb and wires.

Most dome lights have three wires:

  • constant power
  • power when the door is open
  • ground

There is usually a 3 position switch. When the switch is in the default position, the power from the door open circuit allows the light to come on when the door is open. When the switch is moved to full on, the constant power keeps the light on. When the switch is off, the light will never come on. The ground is used as the return in all scenarios when the light is on.

I would extend these 3 wires to your new location, and use them for your new light as well. That way the light will come on when the existing light does. You could optionally include your own 3 way switch to have the front and rear lights permanently on/off independently of each other.

raydowe
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