led with dimmer switch and push button

so im trying to wire up some interior leds to work with my dimmer with a 5 pin relay i have laying around.. this is what im thinking.

pin 87: led positive
pin 87A: not used
pin 86: ground
pin 85: push button
pin 30: dimmer




can anyone confirm this will work?
if it helps i have a 2000 es300.

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noel batista

Why the relay?

Why not the switch powering the dimmer direct with dimmer straight to the LEDs?

If it's to individually connect LEDs to a single dimmer then ok, though a mere switch would be better.

I only have one dimmer (my cars built in dimmer.. And its 4leda I need to wire.. But I guess it would make to sense to wire ot directly. But would it blow out the fuse?

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noel batista

Those four LEDs will pull about 120 mA!

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

What kind of dimmer are you connecting the LEDs to?

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Kevin Pierson

Good point KP, I just realised my car uses a PWM system to control the 3 lots of dome lights though I changed them all to LEDs.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

batista wrote:

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But would it blow out the fuse?

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Using the relay makes no difference to the load on the dimmer.

sorry i dont know much about how volts work, but is 120ma alot?

if so then should i just connect pin 30 to the battery with a fuse and forget about my dimmer?

i wanna get it straight because i also have a dp-dt toggle switch so that i can switch the leds to flash to my bass and switch them back to a steady light when i ever i want and i dont wanna be going back and forth inside my car.

(kpierson20) i wanted to use my cars dash lights stock dimmer

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noel batista

You don't need the relay if you have a DPDT switch.

Assuming you mean to have the LEDs either connected across a speaker or "normal" dimmed internal lighting, the wiring depends on dimmer polarity. But DPDT switching caters for all situations.
One position of the DPDT switch is connected across the dash lights.
The other position across the speaker.
The centre terminal (common) to the LEDs.
Ensure the +ve side of the dash lights is on the same pole (contact set) as the LED +ve.


Re current, 120mA is less than what the relay coil takes.
120mA is the current taken by a 1.5W 12V bulb, ie less than a typical 2W or 3W dash illumination bulb.
So yes, 120mA is a low current as far as loads are concerned. (But high if left connected across a battery. Low & high are relative...)

Re voltage and current, and using the water analogy...
Voltage (symbol & unit = Volts = V) is like water pressure - it's the "force" behind the water or electricity.
Current (symbol = I and unit Amps = A) is the quantity or flow - ie, the liters per second of water flow. (Amps is charge (q) per second.)
The two are related by resistance R (V=IR).
Resistance is like the friction or diameter of a water pipe. Fattening the pipe (decreasing its resistance) increases the water flow (Amps). Or, for a given pipe, increase the pressure (Volts) to increase the flow/current (Amps).

oh ok i see what you mean

my best bet would be to take out the relay, connect my leds directly to my dpdt switch and to my dimmer... thanks ill post some pictures up when im done...

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noel batista