i am rewiring my switch to stop the dtc. I could not find 1 watt 47 ohm resistors but I did buy 1/2 watt. will this be fine or do I need the 1 watt? Also do the diodes have any specific way they should be pointing?

 

anybody?

 

are you using LED's? If you are, radio shack has LED's with 1 watt resistors in them.

 

I used 1/2 watt resistors and it's working fine for me.

 

sweet thats what i needed to know. how about the Diodes though?

 

If you refer to the Fan Mod with a toggle switch and the LEDS

Heere is how your do it if you wanna know.


** Typical LED's.... 2v and 20 milliamps working values.

** Typical voltage with engine runing is 13.8volts

13.8volts voltage minus 2 volts absorbed by the LED equals
11.8V this is the voltage that will run across the resistor.



**Now we calculate the resistor... R = V/I
where R= resistance
V= voltage across resistor
I= amps across the resistor


R = (11.8/0.020) or 550 Ohms


**Now we calculate power consumption

Watts = (Volts X amps) across your 550 Ohms resistor

W= (11.8 x .020) or 0.236 Watts

** A 1/4 Watt resistor (0.250 watt) or more will do just fine.


%%% - %%%


**if you curios about how much power is being used by the LED
then use the voltage across the LED times the Milliamps
passing through it.

or ( 2v x 0.20) equals ( 0.04 Watt)


you can use the same method if your LED has diff values.

I hope this helps to understand it .... oh and yes the LEDs are
polarized.... one lead to the positive the other to ground.


Oh if you dont find the exact resistor value get the closest one
with a higher Ohms value you can find... anything up to 700ohms can work just fine...


Marvin

 

thanks marvin. Very informative

 

Dang Dang Dang dude... I did all the calculations for your status Leds...

I just realized you were refering to the Resistors to keep the PCM from throwing codes... My bad... sorry

I dunno how the PCM reads the fans so I cant predict if the resistors mentioned by the other memebers will work or not..


Sorry..for the confussion

Marvin

 

no problem. I installed them and there not throwing a code so everything is good.