Yeah glow plugs are not as necessary on direct injected engines. I'm not to worried right now as I plug my diesels in when it's that cold. But what if....?????

I am starting to change my opinion. I've been researching all night, and after hearing that yours is doing the same thing. I have a good understanding of the QOS system used on these engines. I know a (little) bit about AC current and believe the same rules apply to DC.

The way I understand it, the sensing resistor measures the current (amps) the plugs are drawing and uses that to determine the heat of the plugs. As heat goes up, so does resistance. Actually that should be the other way around, the resistance is what makes the heat. Either way, as they heat up the amps getting "through" goes down. That's what the sensing resistor picks up on and cuts the voltage back to 6 volts to keep from burning the plugs out.

So, 12 volt plugs should require half as many amps as a 6 volt plug (at 6 volts). This is why a 6 volt plug will heat so fast, and self destruct, on 12 volts. Just like a 240 volt AC electric appliance needing half as many amps to operate as it's 120 volt equal. There's a math problem I knew for that, but it has been lost.

Anyway, what I'm getting at is I don't think the (maybe) 12 volt plugs would cause this problem. I think they would work poorly, but should work.

I think I have other issues going on. I need to do a voltage drop test and check the resistance of the power wires. I think I have power supply issues....

This is all speculation, combined with a little bit of scattered knowledge, which can be a bad combo. We'll figure it out though......

The truth is out there <img src="/forums/images/graemlins/smile.gif" alt="" /> <img src="/forums/images/graemlins/smile.gif" alt="" />