Glow Plug Relay - Ford Powerstroke Diesel Forum
 
LinkBack Thread Tools Display Modes
post #1 of 5 Old 01-25-2013, 04:01 PM Thread Starter
Powerstroke.org Rookie
 
Join Date: Jan 2013
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Glow Plug Relay

My truck has been hard to start in the cold so I thought I would check the glow plug relay. Turned the key on to light up the glow plugs so I could check for voltage.I here the relay click and get 12 volts on batt side and no voltage on glow plug side. So I think bad relay. Install new relay and same result no voltage on glow plug side. Removed glow plug wires from relay and test again. This time after click there is voltage on both post , touch glow plug wires to post volt meter drops to 0 voltage. Both relays test good old one and new one. What might be up with my glow plugs?

1999.5 F250 7.3L Crew Cab LB 4x4
stonedel is offline  
post #2 of 5 Old 01-25-2013, 07:03 PM
Powerstroke Techie
 
Join Date: Apr 2012
Posts: 2,180
Thanks: 43
Thanked 83 Times in 83 Posts
Mentioned: 41 Post(s)
Quoted: 104 Post(s)
Feedback Score: 0 reviews
try disconnecting one valve cover gasket connector and test again. isolate which side is causing the problem. then, pull the valvecover of that side and see what's going on in there

the richest ones are not those who have the most, but those who need the least
kaya is offline  
post #3 of 5 Old 01-26-2013, 05:48 AM
Compression Ignition Addict
 
Join Date: Dec 2007
Posts: 6,280
Thanks: 7
Thanked 249 Times in 240 Posts
Mentioned: 6 Post(s)
Quoted: 90 Post(s)
Feedback Score: 3 reviews
Quote:
Originally Posted by stonedel View Post
My truck has been hard to start in the cold so I thought I would check the glow plug relay. Turned the key on to light up the glow plugs so I could check for voltage.I here the relay click and get 12 volts on batt side and no voltage on glow plug side. So I think bad relay. Install new relay and same result no voltage on glow plug side. Removed glow plug wires from relay and test again. This time after click there is voltage on both post , touch glow plug wires to post volt meter drops to 0 voltage. Both relays test good old one and new one. What might be up with my glow plugs?
This manes No Sense to me.... I don't see how it could possibly be the GPs. They are, basically, already a dead short. What more could they do than that to the relay???

Are you sure your testing method is right? Let's go to the basics...

Take the two sm wires off the relay. Get two jumper wires (you've got those sm ones w/alligator clips on them?) and put battey voltage (+) into one of the sm terms on the relay, clip the other jumper on the other term, and touch Ground (-).

The relay should Throw (loud click). At this point you have connected the 2 large terminals on the relay. Battery voltage (+) will be at both sides. Since that relay will supply 200A across those terminals, if the problem was on the other side (GP delivery), anything over that would just SMOKE.

If the GP side drops to "0" then the supply side would have to also (meaning your batteries just dropped to 0). Are you sure that's not what's happening?
NoRalPh is offline  
post #4 of 5 Old 01-26-2013, 08:59 AM
Powerstroke Techie
 
Join Date: Apr 2012
Posts: 2,180
Thanks: 43
Thanked 83 Times in 83 Posts
Mentioned: 41 Post(s)
Quoted: 104 Post(s)
Feedback Score: 0 reviews
hmm. i was thinking too much resistance to allow current to flow. like maybe burnt uvch pins. that still wouldn't seem to make sense though, since op is not testing in series. op, how exactly are you testing? where are your leads?

the richest ones are not those who have the most, but those who need the least
kaya is offline  
post #5 of 5 Old 02-07-2013, 07:23 AM
Powerstroke.org Rookie
 
Join Date: Aug 2011
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
What you have is a problem with the supply current to the solenoid. Somewhere between the battery and the solenoid, there is a bad connection or wire. Do the same test with the wires to the glow plugs disconnected while checking the voltage at the fuses for the glow plugs in the fuse box. If you get 12v with no load and 0 volts with a load, then you may have a corroded fuse that wont let the current pass. If the fuses are good and clean, you will need to follow the wires that supply the power to the fuses back to where they tie into the battery. I am not sure but I think they draw power from a junction on the passenger side fender. Someone else may be able to help answer with the location.
lanierboatsales is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Ford Powerstroke Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome