Reply to "Melting TIU Aux Power plugs!"

I am using the 20-volt output of a KW to power the TIU’s until I change to individual 18-v transformers for each TIU. The KW is about 100 feet from TIU-1 and 60 feet from TIU-2, and I am using 14-AWG wire. The KW, and eventually 18-volt transformers, is at the control center so I can turn both TIU’s on/off easily.

Here are some facts that just caught my attention (just measured it):
• Voltage at the KW 20-volt posts, with both TIU’s connected, is 13.8 volts!

• Voltage at these posts with only TIU-2 connected is 19.2 volts. Voltage at the unplugged TIU-1 plug also is 19.2 volts, as would be expected.

• Could not measure the true open voltage because I cannot remove the plug from TIU-2!
Earlier, I thought that this plug was fine, but it is not; it also looks partially melted. This plug is a factory wired plug.

So it appears that TIU-2 does not load down the KW’s 20-volt output very much as it still measures 19.2 with only TIU-2 powered up.

But when TIU-1 is connected, the drastic drop to 13.8 volts at the KW posts makes me think that something abnormal is happening at TIU-1.

Your thoughts?

Thx

Alex