Originally posted by captinjohn
AT Last..... a sensible answer. Blabree, I agree with you completly....I see no way to hook glow plugs in series. I bet someone will have a different view !!!!!! Thanks Capt,n 
Its funny it won't work. I have been doing it this way for 7 years.
BTW I am a graduate Electrical Engineer with 40 years of experience. Glow plugs can be hooked in series!
With the hookup I described above and usung 1200 mah batteries and Fox RC long plugs the batteries will last about 1 hour. Fox plugs require less current than some others.
You don't need insulating threads on the glow plugs. The inner connector is isolated from the outer part. Otherwise they would not work at all