Unplug Third Channel, 2nd Channel plays

[bnacht 10+ year member]

let's say your installing a system. everything is working just fine. each particular channel is testing positive. you wire each individual speakers positive and negative in order. 1st channel, 2nd channel, 3 channel, etc….. But when you plug in the third channel, the second channel stops working. it's not only until you unplug the third channel that the second channel will start to work again. keep in mind channel #4 has not been plugged in yet.

my question is what would you try to do to get the 2nd channel working while keeping the third channel in?

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[Kingstroker 10+ year member]

Sounds like a bad RCA. Swap them around on the amp end and see what happens. It could also be a pinched speaker wire. AWAYS turn your HU off while doing this, some amps and speakers don't like you making connections while hot.