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Yes, I only tested it a couple times since It appears my vehicle is over-charging. I wouldn't be surprised if that is the reason the start box took a crap in the first place.

Got the box, temp sensor, and a few other items from Mike @ Black Dog. Put it all together and now the voltage at the glow plugs starts out at 24v for about 10 seconds, then drops to 4.5v for about another 15-20 seconds and shuts off. Seems to be working OK 8)

I mean, if you connect your glowplugs backwards I think you have some other more important problems :lol:

Ordered a new box, plugs, and a few other misc items from Black Dog. Excited to finally get this thing all fixed up!

So, I just went out and checked and the glow plug connector is showing 24v. However, it continues to show 24v even after sitting for 5 minutes. Based on what you said it sounds like the controller box is bad supplying a constant 24v to the glow plugs which results in burning up all the glow...

So how could the box be toast if I am getting a constant 24v to the glow plugs? It is strange that when i install the known good box the wait light flashes. When I ordered parts I bought specific M998 temp sensors, is there a specific one depending on which box you have? Would brand new...

I have 2 M998's and the other one has no cold start issues. I swapped the box from the good truck to this one and it made no difference. However, something strange did happen with the "known good" box. I didn't check the voltage on the glow plug leads, but the wait light would turn on and off...

Have a m998 with 9k miles on it. It's all original and in nice shape. About 6 months ago it stopped cold starting and have been trying to figure it out ever since. So far: Each lead to the glow plugs have been verified 24v when the wait light is on. Wait light is on for approximately 10...