I just installed a JVC KD-R300 cd player into my car but I can't get the power to come on

Question edited for clarity and proper model designation.
Question moved to model category.

Page 2 of the manual refers

https://www.manualslib.com/manual/81791/Jvc-Ma372ien.html?page=2#manual

JVC KD-G140 Instruction & Installation Manual

ManualsLib https://www.manualslib.com > manual > Jvc-Kd-G140

View and Download JVC KD-G140 instruction & installation manual online. CD Receiver. KD-G140 car stereo system pdf manual download. Also for: Kd-g240.

JVC KD-G140 - CD receiver

Crutchfield https://www.crutchfield.com > ... > All car stereos

MOS-FET Amplifier: The JVC KD-G140 features a MOS-FET amplifier that is CEA-2006 compliant and rated at 20 watts RMS x 4 channels in 4-ohm and 1% THD+N with a ...
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In-Dash CD Receiver - KD-G140 - Introduction

JVC https://support.jvc.com > consumer > product
Plug your iPod or Digital Audio Player into the front the KD-G140, which boasts great features such as a selectable Rear/Subwoofer output with level control ...

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You need to look through the JVC KD-R210 manual.
A JVC Dealer / Installer may have seen a similar problem & suggest remedy.

www.jvc.com/support

Does it turn on when inserting CD or ejecting CD? If so, then the RED wire is not connected

You may download the installation and instruction manuals from http://books.jvc.com/booklist.asp?Model=kd-r300

If your player didn't after you correctly connected to the power then it will be better if you take it to the nearest repairing center. If your player is under warranty, i think they will charge to fix it cos you broke the warranty by connecting to the wrong way.

You may download the KD-R300 manuals here.

trying to set up a jvc KD-R326 does anyone which wires are the power ones?

Try going to the crutchfield website and look for help installing stereo. they can get you vehicle specific wiring codes for free. Also, almost everey stereo has common color codes for wiring. red- switched batt. +, yellow-constant batt. +, black= ground, blue- power anrenna, etc.

If you need further help, reach me via phone at https://www.6ya.com/expert/david_f2436a37cbb50365

HOW TO HOOK UP A JVC CAR CD PLAYER TO A 1993 COUGAR