Glow plug testing question (w123)

[FormulaReed]

Hi,

So I have been trying to get my 300d started again and I am having a problem.

I tested the glow plugs per the DIY on the diesel giant page. When I have the harness that goes to the glow plugs disconnected from the relay and I turn the key, all seems fine. I get 12v at the power input, across both sides of the 80 amp fuse and at the male terminals that go to the glow plugs. However when I have the harness to the glow plugs attached and turn the key I don't see 12v anywhere untill the realy clicks off. I am also not seeing any power (I am testing for volts) at the glow plugs. When I test the wire at the female end, I am seeing .6 to 1.0 ohms to all the glow plugs but the terminals that are labled B and TC I am not getting any reading.

What do you all think is going on? The relay is woking untill I hook up the glow plug harness. I am pretty sure that the wire is ok but I don't know what B and TC are. Does this sound like a dead relay or is the wire shorted out and causing the relay to stop working?

Thanks,

Reed