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Old 08-03-2019, 07:00 PM   #1
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Brand: Thor Motor Coach
Model: Thor ACE 30.2 Bunkhouse
State: Nevada
Posts: 30
THOR #5275
Issue with ACE power connector

So we have been using our 30.2 for almost 3 years. Monday was a very hot day in LasVegas and the power went out. I checked the breakers in and out and neither popped. I did smell something and then realized the connector was smoking. I disabled the outside breaker and found the connection and cable end melting and brown.

We ordered a replacement called a smart plug however it makes you think how quickly a fire could have started. I never before realized the twist lock design was known to have issues with temperature and failure.
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Old 08-03-2019, 07:41 PM   #2
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Brand: Thor Motor Coach
Model: 2013 ACE 30.1
State: Alberta
Posts: 778
THOR #2631
So it was the twist lock power cable connector end which connects to the coach that melted, not the shore power pedistal plug connector end? When any cable electrical connector gets hot from high load currents and perhaps less than ideal (meaning resistive) connections between mating electrical surfaces, you usually start getting metal surface oxidation and extra heat generated. Over time and under continuous high load currents the oxidation gets worse and can result in the electrical connector surfaces getting even hotter; making more oxidation (more resistance to current flow) etc. So it pays to regularly inspect the connections at the cord plug/receptacle ends as well as on the connections on the outside of the coach for signs of discolored electrical connection surfaces and overheating. Glad that no fires happened in your situation.

By the way, this problem can happen on any electrical connector/connection, not just twist locks. Look how many folks have had burned up transfer switch wires from poorly connected marretted wiring splices.
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