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General Car Audio
car radio battery wire 0v when harness is disconnected from the car radio, but after harness connected to the radio , it has 12v, why??!!
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<blockquote data-quote="lh333_34" data-source="post: 8835615" data-attributes="member: 688526"><p>Hi everyone</p><p>I am new in this forum and this is my first thread.</p><p></p><p>Car model: Toyota echo 2004 sedan.</p><p></p><p>I used a multimeter to test the car radio battery wire ( blue/yellow) when it was disconnected from the car radio, its reading was 0v. ( as shown in photo 1 ) before and after ignition, isn't it supposed to have 12v even being disconnected from the original radio?</p><p></p><p>but after I connected the original radio to the harness, its reading was 12v before the ignition (as shown in photo 2) , and 12v after the ignition ( as shown in photo 3) .</p><p></p><p>I would like to find out why it is like this?</p><p></p><p>When I tried to connect an after market radio to the harness, the battery wire still read zero before and after ignition, because of this, the after market radio could not be powered up. ( I tested it on direct 12v power supply, the after market radio was working) .</p><p></p><p>I am looking forward to getting some advice from experienced members on this forum.</p><p></p><p>Thanks in advance.</p><p></p><p></p><p>photo 1 ( harness disconnected from the original car radio )</p><p>[ATTACH=full]48364[/ATTACH]</p><p></p><p></p><p>photo 2 ( before the ignition)</p><p></p><p>[ATTACH=full]48366[/ATTACH]</p><p></p><p></p><p>photo 3 ( after the ignition )</p><p></p><p>[ATTACH=full]48367[/ATTACH]</p></blockquote><p></p>
[QUOTE="lh333_34, post: 8835615, member: 688526"] Hi everyone I am new in this forum and this is my first thread. Car model: Toyota echo 2004 sedan. I used a multimeter to test the car radio battery wire ( blue/yellow) when it was disconnected from the car radio, its reading was 0v. ( as shown in photo 1 ) before and after ignition, isn't it supposed to have 12v even being disconnected from the original radio? but after I connected the original radio to the harness, its reading was 12v before the ignition (as shown in photo 2) , and 12v after the ignition ( as shown in photo 3) . I would like to find out why it is like this? When I tried to connect an after market radio to the harness, the battery wire still read zero before and after ignition, because of this, the after market radio could not be powered up. ( I tested it on direct 12v power supply, the after market radio was working) . I am looking forward to getting some advice from experienced members on this forum. Thanks in advance. photo 1 ( harness disconnected from the original car radio ) [ATTACH type="full" alt="zero vol.jpg"]48364[/ATTACH] photo 2 ( before the ignition) [ATTACH type="full" alt="12v before ignition while connected to the original radio.jpg"]48366[/ATTACH] photo 3 ( after the ignition ) [ATTACH type="full" alt="12v after ignition while connected to the original radio.jpg"]48367[/ATTACH] [/QUOTE]
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Car Audio Discussion
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car radio battery wire 0v when harness is disconnected from the car radio, but after harness connected to the radio , it has 12v, why??!!
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