By Sage Switzer. Wiring Diagram. Published at Thursday, June 28th, 2018 - 09:35:58 AM.
Your amplifier will have a lead designed to mate with this wire, and they can be crimped or soldered together based on your own preference. Once they're connected, the turn-on wire will automatically cue the amp to power up once the radio is turned on. (Reference the two illustrations at the beginning of this article to see the blue turn-on wire.)
Keep the factory amp in play. Many wiring harnesses can let you keep your vehicle's factory amplifier when replacing the stock radio. They include connections that directly tie the outputs of your new car stereo into the factory amplifier's inputs. So, you'll be using the factory power for your speakers, instead of the power from your new radio.
These harnesses can sometimes shorten the installation time, since wires often do not have to be run to the factory amplifier location, but they tend to be more expensive than the bypass harnesses above. You may also see a module connected in these harnesses — they include adjustments that enable you to properly integrate your stereo's speaker outputs and the factory amp's inputs to keep your music clear.
Amplifiers have slotted cooling fins on their surface to release internal heat that builds up. (Power amps can get quite hot to the touch.) When you select a location, make sure the cooling fins have plenty of space around them to dissipate heat which will radiate upward. The fins should face the sides or top of the amp. Mounting an amplifier upside down is a no-no, because the cooling fins will be on the bottom and dissipated heat will radiate back up inside the amplifier unit where it can't escape.
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