How to bypass PCB? I am aware some HMMWV owners have done it. TOBASH

[TOBASH]

H1 is 12v and it’s not uncommon to burn up glow plugs over time…so, no…this will not stop glow plugs from eventually failing.
The H1 uses AC60g’s but unfortunately uses a spade tip, as far as I know, there is no 12v bullet type GP.
You can use 12v on a regular Hmmwv glow plug.

My concern is NOT blowing out plugs.

My concern is swelling. 12V seem to do it less,

IMHO

Also easier to find 12V at NAPA last minute, for when I forget to call the awesome people at Kascar, HPG, etc….

 

[Retiredwarhorses]

My concern is NOT blowing out plugs.

My concern is swelling. 12V seem to do it less,

IMHO

Also easier to find 12V at NAPA last minute, for when I forget to call the awesome people at Kascar, HPG, etc….

glow plugs swell, even the so called “non-swell”
Even some splatter the size of a grain of sand will cause a plug to fight to come out.
Like I said, the issue is the the bullet tip type GP, and may I remind you…you’re scenario is one that lends you’re thought process as if the truck will not run with bad glow plugs, of course you know it will and it will just be stubborn to start, but you only need a glow plug or 2 to make that happen…so IMHO, this 12v thing is not worth the effort, especially since you all tell everyone that the box will never fail and you won’t
Fry glow plugs cuz your finger in the controller….this is a solution to a non-problem me thinks.

 

[Humpty]

Two things.

First, decreasing voltage to the glow plugs will increase amperage. I'd think the likelihood of swollen glow plugs would increase with them drawing *more* amperage.

Second, are you guys really laying on your glow plugs? I hit mine for 1 mississippi 2 mississippi 3 mississippi 4 mississippi and she pops right over down to 25 degrees or so.. colder than that and I'll repeat the 4 count and off she goes. My glow plugs are all fine. No swelling. I've made it a point to frequently check them because I run the dreaded Chinese cheapos that i'm told are prone to swelling up to roughly the size of a kielbasa - but a year in of daily driving and they still look fine.

I feel like the janky "smart boxes" are more likely the culprit to swollen glow plugs rather than voltage.. and perhaps the pulsing cycle they like to do after the engine starts.

BONUS 3rd thing ... according to my AM GENERAL troubleshooting guide, the HMMWV glow plugs ARE 12v glow plugs running on 24v.