I've tried to add some lights to the car and when I connect them to the interior lights circuit, all of the interior lights stay on.

Is this because these too much resistance in the circuit..?

Is there any way I can rectify this..?

SuFz

Hmm the only thing I can think of that will keep all of them on on if you have shorted the negative wire (green and orange) of the interior lights to the body. :)

Dunno about the cause, or whether it's simply a wiring stuffup, but if for some reason additional lights do make a difference, you could isolate them from the circuit by using either a relay or mosfet (or numerous other methods); use the lighting circuit to simply trigger it, so the new lights are on their own separate circuit. Should then negate any influence on the lighting circuit.

All I did was splice into the footwell lights and run them from there.

After doing that, all the interior lights stayed on and wouldnt switch off.. I'm thinking now I'll try the ones in the door so the lights switch on when the door light switches on.

I'll try and connect a different style of light to them again and see how that goes.. If it works, then I know its the lights that it doesnt like.

How would I use the interior lights as a trigger..?

Run a direct positive and then use the negative as a trigger..?

SuFz

The interior lights, use the negative as a trigger. One wire in constant positive (red with a black stripe) and the other is negative trigger (Green with a orange stripe). Also are you using LED's ? In my car I had LED's and they would stay on, because a small amount of current still remains in the negative even though it has been switched off, so had to go back to using the normal bulbs. :)

Yeah.. LEDs..

If I put a resistor on the negative line would that solve the issue..?

SuFz

So.. Any ideas..?

SuFz

All I did was splice into the footwell lights and run them from there.

What do you mean there? Did you splice in then run the other end to a positive source or to ground?

I spliced into the footwell loom..

-------------\
--------------------------------
-------------/


+++++++++\
+++++++++++++++++++++
+++++++++/


See what I mean.. 1 makes 2.. :D

I... nope. No idea what that diagram is supposed to mean.
Did you insert the new lighting between the old lighting and the power source (ie. in series), or across the old lighting (ie. in parallel)?

ie.
original:
---------( old lights )+++++++

series:
---------( old lights )( new lights )+++++++

parallel (ignore grey dots):
---------|( .old lights. )|+++++++
.............|( new lights )|

I'm guessing parallel (series wouldn't work anyway), so maybe if they are LED there may be a current leak somewhere so the system never turns off. Will think on it, not at my most analytical at the moment...

Yeah.. My diagram got all screwed up when I posted it..

Couldn't be series.. it was Parralel..

If I put a load line resister on there, that should solve the issue! Basically grounds the light once its off, to get rid of the power sitting in the line!

SuFz