that's why I for all those reasons i actually connected a switch on the dash to manually run current straight from battery to glow plugs but makes no difference, the reason I did this was for the reasons you mentioned not going through existing wiring and have spoken to mechanic who is going to install the plugs that cost $100 each about testing circuit to plugs again. I used to do all this work myself before I broke my back but its too awkward for me now. I have had experience with electrics before and know that with car electrics even when I was younger it was beyond me as I didn't have tools or equipment, your info was informative and helpful thx. He has looked into the manuals and found that in a lot of cases there is a generic plug $60 and plug recommended by manufacturer $ 100 -- its a process I suppose the best way of putting it. I do have a question tho from your info with power going through the car circuit normally is the voltage that goes to the plugs higher then 12 volt ???????? Now to throw spanner in works as there maybe something else as this msg I add to it, this mrn altho not cold I went to start car it cranked for 3 secs then I put accelerator flat to floor and it started straight away, it has new air filter that's why I for all those reasons i actually connected a switch on the dash to manually run current straight from battery to glow plugs but makes no difference, the reason I did this was for the reasons you mentioned not going through existing wiring and have spoken to mechanic who is going to install the plugs that cost $100 each about testing circuit to plugs again. I used to do all this work myself before I broke my back but its too awkward for me now. I have had experience with electrics before and know that with car electrics even when I was younger it was beyond me as I didn't have tools or equipment, your info was informative and helpful thx. He has looked into the manuals and found that in a lot of cases there is a generic plug $60 and plug recommended by manufacturer $ 100 -- its a process I suppose the best way of putting it. I do have a question tho from your info with power going through the car circuit normally is the voltage that goes to the plugs higher then 12 volt ???????? Now to throw spanner in works as there maybe something else as this msg I add to it, this mrn altho not cold I went to start car it cranked for 3 secs then I put accelerator flat to floor and it started straight away, it has new air filter

well all fixed now, after glow plug broke off while trying to replace them and head had to be taken off, head and block where checked all good. the more expensive glow plugs put in instead of generic ones the car starts like it was brand new again ;) well all fixed now, after glow plug broke off while trying to replace them and head had to be taken off, head and block where checked all good. the more expensive glow plugs put in instead of generic ones the car starts like it was brand new again ;)

That really depends on how you drive, lots of starting short drives very greatly reduces the lifespan. So the answer is "it depends" That really depends on how you drive, lots of starting short drives very greatly reduces the lifespan. So the answer is "it depends"