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Old 07-13-2018, 06:40 PM   #1
RJV
 
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Default Glow Plug Test--Before I Zap Myself or Fry Something

Ok, I'm about to attempt the in line fuse method glow plug test, as I am replacing the module and have easy access to that area of the van. Before I zap myself or fry something, I want to make sure I have it all down correctly.

I am using an inline fuse with a 20A fuse and 12g solid wire. I believe that is correct based on other threads.

I just installed a new glow plug module. The battery cable to the new module is connected and the battery is once again re-connected to the vehicle. In other words, the new glow pug module is fully installed and all the electrical is hooked up like normal.

I will pull the 5 port plug from the module. With my in line fuse tester I will place one end of the 12g wire(with a small flat connector at the end) into 1 of the 5 ports, each one corresponding with a different glow plug. I will then take the other end of the in line tester and touch it to the positive side of the vans main 12V battery. I will hold here for at least 10 seconds. If the glow plug is open/bad, the fuse will blow, if it is operating it will not.

Is all of that correct?

Thank you.
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Old 07-13-2018, 08:21 PM   #2
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Default Re: Glow Plug Test--Before I Zap Myself or Fry Something

If the plug is open it won't blow, only a short will blow the fuse.
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RJV (07-14-2018)
Old 07-14-2018, 12:13 AM   #3
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Default Re: Glow Plug Test--Before I Zap Myself or Fry Something

Quote:
Originally Posted by Midwestdrifter View Post
If the plug is open it won't blow, only a short will blow the fuse.
Got it. I had one fuse blow for GP3. On GP1, 4, and 5 the fuse was fine but I did notice that when I'd connect the battery end of the inline fuse to the battery I'd hear a little "tick" or spark noise. On GP2 this did not happen, and the fuse also did not blow. I'm guessing that means there is also an issue with GP2?
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Old 07-14-2018, 12:32 AM   #4
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Default Re: Glow Plug Test--Before I Zap Myself or Fry Something

Yep, gp2 is open and non functional
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Old 07-14-2018, 12:37 AM   #5
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Default Re: Glow Plug Test--Before I Zap Myself or Fry Something

Cool. I'm likely going to change them all between now and November just so I know they're all new, but it's good to know how to test and what the results mean moving forward.
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Old 07-14-2018, 01:22 AM   #6
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Default Re: Glow Plug Test--Before I Zap Myself or Fry Something

Do you have the newer updated module? If not, the shorted plugs will have blowing the internal (non replaceable fuses). The newer updated glow plug control module has self resetting breakers.
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Old 07-14-2018, 01:40 AM   #7
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Default Re: Glow Plug Test--Before I Zap Myself or Fry Something

Yes, I actually replaced it today and figured I'd test the plugs using this method while I had the grille and headlight removed. Bought the van Monday(a 2004, I also have a 2006), check engine light came on yesterday morning. Had a local shop run the codes(I have a code reader currently shipping to my house): PO380, PO672, 673, 674. After running a few errands the check engine light went away. After researching decided to change the module to the newer design and test the GPs. I assumed the original module was still in there and was a bit surprised to find out today that it was in fact already changed at some point to the solid state design. Replaced it anyways since it was all taken apart. Plan to order some glow plugs and replace all 5 in a few weeks, very carefully.
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