Bad #3 glow plug

[Scooteryeti]

Just a weekend mechanic. I own a 2014 Ram Ecodiesel. I bought it to replace my 2000 Dakota 4.7 with a tow package because the Dakota had a 5000 lb limit and my boat weighs 6000 lbs. I hope to keep this a long time. I have 130,000 miles and had to have to inner cooler and intake manifold replaced at 78,000. Now that I'm past 120,000 I need to fix it myself, So I'll read as much as I can before I ask a question that's be answered 3 times already.
If I can help anyone. I'll try
Thanks
Scooteryeti

 

[carlhenry]

welcome 2 the group the glow plugs r a pain 2 change the threads get loaded with dirt and corrosion

 

[Scooteryeti]

welcome 2 the group the glow plugs r a pain 2 change the threads get loaded with dirt and corrosion

Thanks. I love a challenge. I'll blow it all out. Spray if with penetrate oil. start it up let get hot to expand the thread gap. Turn it off and pray that it comes out easy.
Why the blue line on the wire pull tab?