Cant figure it out.
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
This was in my previous instructions. A friend needs to be holding the key in START such that the engine would otherwise be cranking.
If that's what was done, this is indicative of a bad starter solenoid (which would keep the battery from being pulled down).
OP, please confirm. If the key was indeed held in START, then double-check that you are getting 12 volts to the 'S' post of the solenoid from the RED with BLUE stripe wire. If that checks out, then the solenoid needs replaced. They do come bad out of the box.
If that's what was done, this is indicative of a bad starter solenoid (which would keep the battery from being pulled down).
OP, please confirm. If the key was indeed held in START, then double-check that you are getting 12 volts to the 'S' post of the solenoid from the RED with BLUE stripe wire. If that checks out, then the solenoid needs replaced. They do come bad out of the box.
Believe Nothing
Joined: Jun 2004
Posts: 7,514
Likes: 398
From: W. Central FL.
This was in my previous instructions. A friend needs to be holding the key in START such that the engine would otherwise be cranking.
If that's what was done, this is indicative of a bad starter solenoid (which would keep the battery from being pulled down).
OP, please confirm. If the key was indeed held in START, then double-check that you are getting 12 volts to the 'S' post of the solenoid from the RED with BLUE stripe wire. If that checks out, then the solenoid needs replaced. They do come bad out of the box.
If that's what was done, this is indicative of a bad starter solenoid (which would keep the battery from being pulled down).
OP, please confirm. If the key was indeed held in START, then double-check that you are getting 12 volts to the 'S' post of the solenoid from the RED with BLUE stripe wire. If that checks out, then the solenoid needs replaced. They do come bad out of the box.
Cargo Master
Joined: Jul 2005
Posts: 2,311
Likes: 366
From: Kansas
continue with FMC's last request for checking voltage at the S terminal....but I'm confused as to exactly what you meant by "If I go from the negative post to the solenoid post for the ignition it will turn over as well"??
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
What do you mean your switch is fine? There's obviously a problem somewhere. How can you tell what's fine and what's not so soon? I certainly can't yet, and I work on circuits for a living. Right?
Are you saying the RED with BLUE stripe wire leading to the 'S' post of the solenoid has 7 volts with the key in START? That's a useful data point. What voltage do you see on the inside of the wire boot coming from the RED with BLUE stripe wire with the wire removed from the solenoid, but the key still held in START (unless that's what you were already reporting)?
Are you saying the RED with BLUE stripe wire leading to the 'S' post of the solenoid has 7 volts with the key in START? That's a useful data point. What voltage do you see on the inside of the wire boot coming from the RED with BLUE stripe wire with the wire removed from the solenoid, but the key still held in START (unless that's what you were already reporting)?
Thread Starter
|
Junior User
Joined: Mar 2012
Posts: 91
Likes: 0
From: Greenville, SC
That is what I am reporting wires off I get 7v. And I tested my switch by taking it out if my truck and hooking it up to the 74 and it works fine.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
Take it easy friend! We don't monitor the forums on the hour or anything.
You're saying with the RED with BLUE stripe wire removed from the 'S' post of the solenoid, the voltage at this terminal with the key held in START is only 7 volts? There are two possibilities:
1) Faulty ignition switch. I'm not interested in what this switch does in another truck. That's an entirely new layer of variables.
2) START circuit is loaded down. The only other place the RED with BLUE stripe hot-in-START circuit runs to is the START input of the ignition module. One last thing you can try is to disconnect the 2-terminal connector leading to the ignition module, and repeat the measurement. If it goes back up to 12 volts from 7 volts, something is wrong with the ignition module, loading down the START circuit too low for the solenoid to make.
It's very unlikely there's a wiring problem. For wiring to be a problem and induce an unwanted voltage drop, there has to be current flowing through it, which would NOT be the case if the measurement was taken per my instructions.
You're saying with the RED with BLUE stripe wire removed from the 'S' post of the solenoid, the voltage at this terminal with the key held in START is only 7 volts? There are two possibilities:
1) Faulty ignition switch. I'm not interested in what this switch does in another truck. That's an entirely new layer of variables.
2) START circuit is loaded down. The only other place the RED with BLUE stripe hot-in-START circuit runs to is the START input of the ignition module. One last thing you can try is to disconnect the 2-terminal connector leading to the ignition module, and repeat the measurement. If it goes back up to 12 volts from 7 volts, something is wrong with the ignition module, loading down the START circuit too low for the solenoid to make.
It's very unlikely there's a wiring problem. For wiring to be a problem and induce an unwanted voltage drop, there has to be current flowing through it, which would NOT be the case if the measurement was taken per my instructions.
Thread
Thread Starter
Forum
Replies
Last Post
Follmerpa
1987 - 1996 F150 & Larger F-Series Trucks
14
Jan 22, 2019 09:11 PM
78BigBlock09
1973 - 1979 F-100 & Larger F-Series Trucks
7
Mar 30, 2010 02:48 PM
allisonmo2
1994.5 - 1997 7.3L Power Stroke Diesel
14
Mar 12, 2009 08:52 PM