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Message: <blockquote data-quote="helotaxi" data-source="post: 387026" data-attributes="member: 550915"><p>Basically you were drawing too much current from the HU lead and it's voltage was dropping just enough that it was not enough to turn on the one amp.  Some amps are very sensitive when it comes to turn on voltage and some HUs cannot provide much current at all through their turn on lead before the voltage starts to drop.  This is why it is always advisable to use a relay to switch more than one amp and any other components on that you want running with the HU.  Good to see that you figured it out on your own.</p></blockquote><p></p>

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