well been running the 12v direct to the glow plugs for a while (controler bypass) and i keep burning up the good motocrafts. its sorta costly and im sick of it anyone got a way to run 6v like the stock controler will use?
glow plugs again
- Thread starter 88beast
- Start date
79jasper
Chickenhawk
Most people would say hook it back up to work like it did factory.... 
But I'd say some type of voltage regulator/big resistors.
Of course I didn't drive my 88 too long, but it was hooked up in the same fashion and I didn't seem to have that problem.
Hate to ask, but what's your timing at?
But I'd say some type of voltage regulator/big resistors.
Of course I didn't drive my 88 too long, but it was hooked up in the same fashion and I didn't seem to have that problem.
Hate to ask, but what's your timing at?
Hydro-idi
Full Access Member
I agree with the above. IMO, the factory glow plug setup works just fine when all the components are functioning properly. No need to put a manual button on it.
Like stated above, if timing is too advanced, it will blow the glow tips off. I had it happen to me lol.
Like stated above, if timing is too advanced, it will blow the glow tips off. I had it happen to me lol.
79jasper
Chickenhawk
The factory 7.3 system sends 12v to the glowplugs.
IIRC, only the early 6.9 used 6v.
Could be wrong though.
IIRC, only the early 6.9 used 6v.
Could be wrong though.
Hydro-idi
Full Access Member
My engine is a 6.9 and it has the 12v GP system in it. I think they started the upgrade in mid 87....or something along those lines.
dmaxjoe
Full Access Member
I could be wrong, but I think it sends 12 volts to 6 volt plugs for faster warm ups.
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Hydro-idi
Full Access Member
I don't think so. If I can remember correctly, the spade style glow plugs are 6v and the bullet point glow plugs are 12v. Mine also has the bullet style glow plugs.
To 88beast, how long do you heat them up for? The stock GPC cycles the glow plugs which helps prevent them from burning out. You may be leaving them on for too long
To 88beast, how long do you heat them up for? The stock GPC cycles the glow plugs which helps prevent them from burning out. You may be leaving them on for too long
79jasper
Chickenhawk
Yes hydro-idi, that's how I've understood they work. Pretty sure my Diesel repair manual says it.
Pino2234
Full Access Member
I was told the opposite by DieselRx, the spade style plugs (older style) were 12 volt and the bullet style (newer style) were 6 volts.
I'll have to do more research.
rockbender
Full Access Member
Are you using the stock wiring harness, or is it rebuilt? I always seem to read about people that decide to rebuild a wiring harness themselves and boast how they upsize the wire because the stock wire is so tiny... Yes, the stock wires are sized that way for a reason. The small wire provides a voltage drop as the current demand goes up to the glow plugs. Make a harness out of #12 or #10 wire and you better believe those plugs will get (too) hot in a hurry!
79jasper
Chickenhawk
Mine worked fine with a bigger custom harness. Actually worked better once I got rid of that puny factory wire.
Of course mine was pushbutton.
Spade are the earlier style.
Bullet are for sure 12v.
Of course mine was pushbutton.
Spade are the earlier style.
Bullet are for sure 12v.
it is push button now im thinking to go back to stock i keep burning them up and my timing was way under so i know it was not advanced timing burning them up. i was using the older spade connectors for my home made harness with 10ga wire. ive tried a few different styles with individual wires on each plug and a single wire with 4 connectors per side. neither lasted long. if i could find a good price on a intake air heater then id plumb one in.
