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<blockquote data-quote="helotaxi" data-source="post: 391211" data-attributes="member: 550915">OK.&nbsp; You should be using the relay to switch everything.&nbsp; If you are having that kind of voltage drop you are definitely asking too much of your HU.&nbsp; Run the turn on from the amp to the relay.&nbsp; Split it from there to the amp and the fans.&nbsp; Measure the voltage across the relay.&nbsp; Check pin 30 to ground.&nbsp; Should be 12ish volts.&nbsp; Check pin 87 to ground.&nbsp; Should be the same as pin 30.&nbsp; If you are getting a drop across the relay, then you need a new relay.&nbsp; Check pin 85 to ground.&nbsp; If you are getting less than 12V you have a problem with your HU remote lead.&nbsp; You can sort of get around this by running a relay off your IGN wire to the HU to turn your amps and fans on and off when your car is on.Per your diagram you have the relay itself wired quite wrong.&nbsp; Check this link for the idea of how it should work.&nbsp; <a href="http://www.6066gmctrucks.org/BoschRelay.htm" target="_blank">http://www.6066gmctrucks.org/BoschRelay.htm</a></blockquote>

[QUOTE="helotaxi, post: 391211, member: 550915"] OK. You should be using the relay to switch everything. If you are having that kind of voltage drop you are definitely asking too much of your HU. Run the turn on from the amp to the relay. Split it from there to the amp and the fans. Measure the voltage across the relay. Check pin 30 to ground. Should be 12ish volts. Check pin 87 to ground. Should be the same as pin 30. If you are getting a drop across the relay, then you need a new relay. Check pin 85 to ground. If you are getting less than 12V you have a problem with your HU remote lead. You can sort of get around this by running a relay off your IGN wire to the HU to turn your amps and fans on and off when your car is on. Per your diagram you have the relay itself wired quite wrong. Check this link for the idea of how it should work. [URL="http://www.6066gmctrucks.org/BoschRelay.htm"]http://www.6066gmctrucks.org/BoschRelay.htm[/URL] [/QUOTE]

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