I've read that overvoltage is one of the main ways GPs/controllers fail, and that it can happen when connected to a charger or running vehicle. If you dont have any facts to refute it then dont jump on it. I have also seen multiple GP failures shortly after people have had replaced alternators and batts.
Read where ??? I have tested many glows and it has been over current and not over volt that has killed them. 9g glows (found in early trucks) are especially prone to overcurrent death about 15 seconds from my own experiments that I just had to do myself with an old 9g glow I had out of an old 6.2 engine I was playing with; most of those have died by now and 9gs as replacements are rare finds these days, as are the 11gs some 11gs still on the market which don't survive much extended glowing either, but they don't swell when they die.
As for jumping if you choose to call it that, happens when I think it prudent to do so and unless provoked by so implication that I'm not doing it without doing my homework I do try to remain objective & unemotional.
As far as implication as to me not having the experience to back what I say, well I probably have as much or more been there done that than most, owning my 1st 6.5 since 2000, & have direct experience behind what it is I'm commenting on, albiet I confess I do have some weakness when it comes to the OBD-Is as I don't own one of those (not germane to this discussion as OBD-I & II when it comes to glow basics are very similar).
Buddy we may not agree from time to time, I'll ask same of you that you asked of me do the physical research and then lets compare results; I have done the physical testing not just read about it somewhere on one of the less than accurate sites, one thing we strive for here is accuracy and not regurgitation what we read/found elsewhere.
So when you say do this and it doesn't make sense to what is conventional wisdom has been found to be accurate with these trucks, I'll question you on it, do not take it personally, if you have a new twist so long as it makes sense to way these trucks function I'll be willing to learn all I can from your assertions, actually your push back at my push back is beneficial as it requires me to hit the books and make sure what I think/say is accurate.
I do have to pause though when a comment is made "I have heard that jumping off, kills glows, or charging kills glows" I have some old glows laying around and a used but good glow controller, if I get time in near future I'll glow it at what you think 15V to see if it dies, I can run that experiment if you like.
I'll surmise (& just a hypothesis) any glows or glow controller that die after new batts or alt were on last legs anyway, and cause of premature death were previous extended glowing from a weakened glow system running undervolt/long current dwell times trying to make starts with low volts.
I just pulled out my 94 GM manual that would cover the OBD-I the only warning in it about over voltage, where the manual says do not bypass the glow controller or jump start with more than a 12V system or damage could occur, only other starting systems on road you could possibly do that with would be a 24V starting system, but if that were the case you would have other issues as well, that would be gross overvoltage.
If one wanted to postulate a battery charger, new alt, or jumper vehicle was putting out gross over voltage then I guess the assertion overvolt could be a risk area hold some merit, but more damage would be out there than just the glow relay and glow plugs which are fairly robust devices, I'd expect to see other voltage sensitive devices to die before glow sytem went out.
I've trouble shot glows and glow relays many times with my battery charger, only time a glow went pop right away was when I had flipped the switch on the charger to 100A
that glow died quiclky.
I have also jump started many dead 6.5s including my own using traditional methods of revving the rescue/running vehicle to get some extra charging amperage to the dead vehicles batteries.
So if you want to disagree with me that is fine, but I'll ask for your data/1st hand experience since you have challenged me to provide the basis of my opinion & points of reference, at end of day we may agree to disagree which is fine with me but both positions will be out there & let others judge who's advice they prefer to follow, simple as that, & with that I wish you a fine good evening to you.
