Relay diagram help

**rion** · May 17th, 2010 03:07 PM

bare with my english guys, I need help how to use the relay for my aux fan speed auto adjustment.

basicaly, I just need the aux fan always at high speed, but when the headlight is triggered, the aux fan turns to low speed using the resistor block. using the negative line.

I need this functionality because my alternator cannot compensate 3 strong aircon aux fans our ride uses together with the headlight * night. ok lang sa araw yun 3 aux fan, but with the headlight at night, di na niya kaya ang load.

I already tested the resitor block, and it helped a lot lowering the load, upgrading the alternator is not on option. woould like to keep all 3 aux fan so I can maximize the cooling.

hope you could help me guys, thanks

**oj88** · May 17th, 2010 06:49 PM

Here you go. I just drew where each wire should go. Make sure to use fuses and properly-sized wires.

**red888** · May 17th, 2010 06:53 PM

nice! truly helpful tip! btw is this for the Bosch relay? Is it also applicable for the other relays as well , i.e Toyota ,Mitsuba ?
thanks a lot thought this truly helped!

**oj88** · May 17th, 2010 07:01 PM

That's based on the standard Bosch relay. You can use any kind of relay as long as it is a "single pole, double throw" or SPDT relay and one that can handle the current requirements of the aux fan(s).

**rion** · May 17th, 2010 07:35 PM

Sweet!

Thanks a lot oj88!

**menggoy** · February 17th, 2011 02:46 AM

sir, pano po iconnect pag hid ang gagamiting ilaw? masyadong po kasing mahina yung 8000k ko.
salamat po.

**miked** · February 17th, 2011 12:16 PM

sir rion,

why not put separate relays for the fans and headlight...mura lang naman relay...it means overloaded na relay mo as per your description....i assume you have the 55/60w headlights which normally consume 4-6Amp. For your fans, i assume they are rated at 100W each x 3 = approx 25 Amp...25 A + 6 A = 31A...the 5 pin bosch relay is rated at 30A. no doubt na hindi nya kayang ibigay lahat ng amperaheng kailangan.

just my thoughts...

**miked** · February 17th, 2011 12:30 PM

Originally Posted by oj88

Here you go. I just drew where each wire should go. Make sure to use fuses and properly-sized wires.

Pardon me here sir 0j88,

i don't mean to insult or whatsoever....

but i think there is something wrong here....

terminals 85 and 86 is the control circuit ("coil")..86 is power from switch, 85 is ground...it shouldn't be connected to a load like the headlight.

terminals 30,87 and 87a is the load circuit ("switch") that goes to your accesory. 30 is fused power from battery positve, 87 is your accesory...87a is usually not used which is at normally closed position.

**lanceloi** · February 17th, 2011 10:18 PM

Originally Posted by oj88

Here you go. I just drew where each wire should go. Make sure to use fuses and properly-sized wires.

kung sa unang tingin mali...pero para sakin tama ito...

**bongski214** · February 17th, 2011 10:42 PM

googled this before and used it when i rewired my headlights, buti di pa nadelete sa hd, hehe, you can modify and and install individual fuse sa bawat relay. hth.