brianjw4

iTrader: (1)

I can't seem to get the check engine light to work. I've got an led with the positive side wired to ignition and the negative side to the brown/white wire. The pcm is throwing a MIL circuit code. It's a 2000 f-body engine / harness.

Has anyone had this issue before? Maybe I'm missing something.

TomM

iTrader: (56)

Do you have the polarity on the LED correct, they only work one way.....check the LED and see if it's good, on a know power source...battery etc..

T,

brianjw4

iTrader: (1)

Yeah, I tested the light. Works fine with when grounding to the chassis and using ignition +.

gofastwclass

iTrader: (2)

An LED doesn't draw enough current to work properly. You need to use a regular lamp or a resistor with the LED. Since I'm at work I can't tell you what size resistor you will need but I think I have a link saved at home with all kinds of goofy info like that.

brianjw4

iTrader: (1)

hmmm, did put a resistor on the led. Will have to try hooking up a regular bulb to the pcm ground and see if it works.

brianjw4

iTrader: (1)

found the problem - previous owner of the harness cut the wire at the pcm - fixed and it works now. Funny, the harness was advertised as with "no cuts" and it had this and the egr pigtail cut off.

thanks for the help guys