IDM mod question

mhfarmboy · #1 (**permalink**) 07-17-2009, 07:08 AM

im wanting to do the idm mod on my truck and am curious about the tolerance of the resistor. ive read you use a 1% tolerance resistor metal film 75 ohms. the only thing i can find at our local electronics supply is a 2% tolereance. will this work or do i need to find a 1% one? help please i dont wanna frig up my idm!!!

mhfarmboy · #2 (**permalink**) 07-17-2009, 07:23 AM

back to the top

**chvyrkr** · #3 (**permalink**) 07-17-2009, 12:01 PM

DO NOT touch it yourself. It's very easy to screw 'em up.

Powerstroke Cowboy · #4 (**permalink**) 07-17-2009, 12:02 PM

there are three differant IDMs 100v 110v 120v. The OBS (94-97) powerstrokes had the 100v IDM. and the PSDs (99-03) had 110v to 120v IDMs.
For the 100v and 110v you need a 75.0K Ohm (75,000 ohm) 1/2 watt 1% tolerance Metal Film resister to make it 140v.

The 120v needs a 73.2K Ohm (73,200 ohm) 1/2 watt 1% tolerance Metal Film resister to make it 140v

DigiKey sells the needed resisters
75.0KX (Violet-Green-Black-Red-Brown)
73.2KX (Violet-Orange-Red-Red-Brown)