I had a cigarette lighter connection that was built into a carry bag for a 12 volt gel cell battery that worked fine for about 12 years or so, then I found it would start giving intermittent connection. Very frustrating after you have done a multi-star refinement of your TPAS on the Argo Navis. After a number of frustrating events I did a close inspection in daylight and found there was originally a metal layer on the inside of the connector that had been degrading through abrasion or similar.
I’ve moved on to solid connections now, either screw strip, or soldered wires.
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