Notices
1994.5 - 1997 7.3L Power Stroke Diesel  

What does this custom switch do?? Help!

Old Sep 20, 2008 | 06:46 PM
  #1  
YZGUYONE25's Avatar
YZGUYONE25
Thread Starter
|
Freshman User
Joined: Jul 2006
Posts: 37
Likes: 0
What does this custom switch do?? Help!

Okay... here is the low down. My buddy bought a switch off e-bay for his 99 7.3. Well it gave him good results so I tried to wire one on my 97 7.3. Can someone tell me exactly what this is doing??? I know nothing about electrical so I am in the dark. I know that with the switch in the on position the idle is slightly higher and my truck runs ten fold better. I drew a picture so show how it is wired. Not the best but hopefully someone can make heads or tails of it!

Thanks!!!

Edit... looks like I can not post attachments so I will describe the best I can.

Okay it starts with a four post 12v/30a relay. Of the four posts two of them connect together and form one ground wire.

One post goes directly to the blue/red wire of the fuel pressure switch.

One post goes to a toggle switch with a 4.7k resistor in it.

From there the other side of the toggle switch runs to a potentiometer.

The second side of the potentiometer runs down the the throttle pedal. It connects to the plug with 2 wires and hooks in to the wire with a 12v source.

Make sense??? Maybe???

Thanks again!!
 
Reply
Old Sep 20, 2008 | 09:53 PM
  #2  
Talyn's Avatar
Talyn
Hotshot
20 Year Member
Community Favorite
Joined: Oct 2003
Posts: 17,799
Likes: 103
From: Ashland City, TN
Sounds like the standard resistor mod everyone does, but with a POT and a Relay in there as well.

It tricks the truck and creates more oil pressure, or fuel pressure. Can't remember which.
Forgot. =\
 
Reply
Old Sep 20, 2008 | 09:53 PM
  #3  
tjbeggs's Avatar
tjbeggs
Post Fiend
Joined: Apr 2004
Posts: 12,835
Likes: 3
From: Silver Lake Dunes, MI
Club FTE Silver Member

That is a fancy 10K mod. Its tricks the computer to think the ICP (injection control pressure) is lower than it is so the PCM increase the pressure with allows more fuel to be injected. The fancy part is that its switched (relay, the mod turns off at idle so you don't get a rough idle known with the mod) and adjustable (potentiometer).
 
Reply
Old Sep 20, 2008 | 09:54 PM
  #4  
tjbeggs's Avatar
tjbeggs
Post Fiend
Joined: Apr 2004
Posts: 12,835
Likes: 3
From: Silver Lake Dunes, MI
Club FTE Silver Member

Originally Posted by Talyn
Sounds like the standard resistor mod everyone does, but with a POT and a Relay in there as well.

It tricks the truck and creates more oil pressure, or fuel pressure. Can't remember which.
Forgot. =\
Too fast for me William. BTW sorry I ignored your calls today I was elbow deep in a E4OD when you called then had to rush to an outing with the wife.
 
Reply
Old Sep 20, 2008 | 09:56 PM
  #5  
Talyn's Avatar
Talyn
Hotshot
20 Year Member
Community Favorite
Joined: Oct 2003
Posts: 17,799
Likes: 103
From: Ashland City, TN
Dude! i was having some serious issues. really needed help too. =*(
 
Reply
Old Sep 20, 2008 | 10:02 PM
  #6  
tjbeggs's Avatar
tjbeggs
Post Fiend
Joined: Apr 2004
Posts: 12,835
Likes: 3
From: Silver Lake Dunes, MI
Club FTE Silver Member

Originally Posted by Talyn
Dude! i was having some serious issues. really needed help too. =*(
VOICE MAIL!!!!!
 
Reply
Old Sep 20, 2008 | 10:05 PM
  #7  
Talyn's Avatar
Talyn
Hotshot
20 Year Member
Community Favorite
Joined: Oct 2003
Posts: 17,799
Likes: 103
From: Ashland City, TN
You have NEVER called me back when i left you a voice mail.
So why should I start now?
 
Reply
Old Sep 20, 2008 | 10:18 PM
  #8  
ron86toy's Avatar
ron86toy
Posting Guru
Joined: Dec 2006
Posts: 1,081
Likes: 0
From: Gladwin,Mi
Originally Posted by Talyn
You have NEVER called me back when i left you a voice mail.
So why should I start now?

thats why I didnt call you back...did not leave voice mail so must have not been important....I was sittin in the garage watchin TV all day,phone was in the house
 
Reply
FTE Stories

Ford Trucks for Ford Truck Enthusiasts

story-0

Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath

 Verdad Gallardo
story-1

Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

 Joe Kucinski
story-2

2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

 Brett Foote
story-3

Top 10 Ford Truck Tragedies

 Joe Kucinski
story-4

AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make

 Brett Foote
story-5

Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!

 Michael S. Palmer
story-6

Ford's 2001 Explorer Sportsman Concept Looks For a New Home

 Verdad Gallardo
story-7

10 Best Ford Truck Engines We Miss the Most!

 Joe Kucinski
story-8

2026 Shelby F-150 Off-Road: Better Than a Raptor R?

 Brett Foote
story-9

2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!

 Michael S. Palmer
Old Sep 21, 2008 | 09:03 AM
  #9  
Talyn's Avatar
Talyn
Hotshot
20 Year Member
Community Favorite
Joined: Oct 2003
Posts: 17,799
Likes: 103
From: Ashland City, TN
The phone rang 1 or 2 times then went to voice mail. So i figured you were busy and pushed cancel.
 
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
superduty4x4
1999 - 2003 7.3L Power Stroke Diesel
15
Sep 6, 2021 10:50 PM
FordBoy2012
1997 - 2003 F150
5
Dec 5, 2012 06:29 PM
PaysonPSD
1999 - 2003 7.3L Power Stroke Diesel
1
Jul 15, 2008 01:20 AM
strokersace
1999 - 2003 7.3L Power Stroke Diesel
12
Mar 18, 2008 12:08 AM
sjb
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
1
Sep 19, 2000 08:37 PM


Thread Tools
Search this Thread

All times are GMT -5. The time now is 09:02 PM.

story-0
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath

Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.

By Verdad Gallardo | 2026-05-30 18:33:59


VIEW MORE
story-1
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

Slideshow: 10 most expensive Ford trucks ever sold on Bring a Trailer.

By Joe Kucinski | 2026-05-27 16:24:34


VIEW MORE
story-2
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

Here's everything that has changed for the latest model year.

By Brett Foote | 2026-05-27 16:17:28


VIEW MORE
story-3
Top 10 Ford Truck Tragedies

Slideshow: Top 10 Ford truck tragedies.

By Joe Kucinski | 2026-05-18 19:34:33


VIEW MORE
story-4
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make

And it might be even better than that.

By Brett Foote | 2026-05-18 19:26:42


VIEW MORE
story-5
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!

Slideshow: Does lowering an F-150 Lobo RUIN the ride quality?

By Michael S. Palmer | 2026-05-18 19:20:37


VIEW MORE
story-6
Ford's 2001 Explorer Sportsman Concept Looks For a New Home

Slideshow: Ford's bizarre fishing-themed Explorer concept has resurfaced after spending decades largely forgotten.

By Verdad Gallardo | 2026-05-12 18:07:46


VIEW MORE
story-7
10 Best Ford Truck Engines We Miss the Most!

Slideshow: The 10 best Ford truck engines we miss the most.

By Joe Kucinski | 2026-05-12 13:09:47


VIEW MORE
story-8
2026 Shelby F-150 Off-Road: Better Than a Raptor R?

Slideshow: first look at the 810 hp 2026 Shelby F-150 Off-Road!

By Brett Foote | 2026-05-12 12:50:07


VIEW MORE
story-9
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!

Slideshow: Everything You Need to Know about the 2027 Super Duty Carhartt Package!

By Michael S. Palmer | 2026-05-07 17:51:06


VIEW MORE