Glow plug resistance?

[Refalgren]

quick question. using a volt meter, what resistance should I be looking at in ohms for a set of AC Delco 60G glow plugs on a stock M1008?

 

[mangus580]

First of all, I would not suggest using 60G's in a stock 1008.

Secondly... honestly, I wouldnt trust an ohm reading to be an end-all tell-all indication the plugs are good. You are much better off pulling each one, and powering them up to check them. I have measured a couple that indicate they are good, but in reality they are not.

 

[BobM]

First of all, I would not suggest using 60G's in a stock 1008.

Secondly... honestly, I wouldnt trust an ohm reading to be an end-all tell-all indication the plugs are good. You are much better off pulling each one, and powering them up to check them. I have measured a couple that indicate they are good, but in reality they are not.

Mangus have you ever burned out a glowplug testing them this way? I had a 6.2 that the PO had tested the GPs this way when he put new ones in. He burnt 7 of them up! I took his word that they were new and good and paid a price (money AND time) for my gullibility!

 

[mangus580]

Mangus have you ever burned out a glowplug testing them this way? I had a 6.2 that the PO had tested the GPs this way when he put new ones in. He burnt 7 of them up! I took his word that they were new and good and paid a price (money AND time) for my gullibility!

Well... you dont hold the power on it for real long... Only takes a couple seconds to see they are heating.

Sure, if you power them up for 15 seconds, you might have issues!

 

[FMJ]

I converted my 1008 to 60g plugs by eliminating the resistor and wiring the supply voltage to the GP relay to a 12v source, and retained the gp controller. If I remember correctly they (60g's) should read 2 or 3 ohms with a meter, I used a Simpson 260 to check mine.

 

[EO2NMCB]

A good glow plug will ohm out at 1 to 3 ohms, anything above or below that and they are bad.

 

[Refalgren]

i keep reading about this "glow plug resistor". where can I find that?

BTW, the truck is running, however I don't think the glow plugs are working though. I think I'm causing just enough friction heat by turning over the engine for 10 seconds or so. probably not a good thing to do in the long run, but _ok_ short time.

I had the GP relay isolated from the firewall with two pieces of paper. taking those out seemed to allow it to start up?

*shrugs* my trucks a picky bastage.

 

[mangus580]

If your truck is starting.... Your glow plugs are working some.

Isolating the relay shouldnt have any effect... UNLESS you have the wrong relay.

Resistor bank is on the firewall behind the engine. Power comes from the Power Blocks on the pass side of the firewall, to the resistor bank, and out to the glow plug relay.

 

[FMJ]

Mike, your a Saint....

 

[mangus580]

Mike, your a Saint....

Wouldnt want to piss off the great WIKI gods....

 

[jj]

OK, what is the issue with using the AC-60G glow plugs in the stock system? I'd bought a set of 60G's from the local chevy store before they were "hostiley taken over", right after i bought the Blazer. This was before i'd discovered this place. The blazer had 13G's. They all still worked. That is the all ohm out about equally. They are still around as emergency spares. The 60G's finally went in this summer, the automatic circuit has never worked, so i don't really have a way to compare the performance of the 13's vs the 60's. The entire time the 13's were in use, i'd pop the hood, clip lead the GP relay and start the truck. Cranking the starter AND the glow plugs at the same time is rough on batteries. When the 60's went in, so did the toggle switch on the dash. Now i can zap the glow plugs, THEN spin the starter. I have noticed that at 25 degrees it takes three verses of "Happy Birthday" on the glow plugs before the engine will light. I don't wear a watch, you see. But i'm wandering here, so what is the issue with the 60g's in the CUCV with an untouched 24 volt system working through the "big resistor" ?

 

[mangus580]

jj, the issue has more to do with the automatic controller. The 60g's are a different resistance, and will not stay on for the appropriate amount of time. Also, there is a chance they wont last as long for this same reason.

 

[jj]

So my 60G's with the toggle switch, completely bypassing the controller should be OK. They certainly do take longer than the 13G's to light up the 6.2. They also take longer than the civilian 2002 6.5 i have. Ihaven't had any issues with starting that thing in two winters so far, so i haven't reached in to see what kind are in there. That vehicle is a "G" van, the turbo falls over the back of the intake, almost on top of the transmission. Take the doghouse off, and i can sit in plush comfort and pull the plugs. Well, almost.

 

[mangus580]

If your 6.5 is starting faster than your 6.2.... get better glow plugs

My 1009 starts much easier than my wife's burb... they both have new plugs in them. I run the wellmans in both, 070 for the 1009, and 050 for the Burb.

The wellman plugs heat much faster than the 60g's, which helps with faster starting.


wish my 6.5 plugs were that easy to do! some dummy put a 4" exhaust on it... now I cant get to 2 plugs...