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<blockquote data-quote="CrazyNorman" data-source="post: 8387013" data-attributes="member: 665993">I&#039;m pretty sure I know what caused this problem, but I have no idea how to approach fixing it.&nbsp; This winter, I went out one day, and my battery was dead.&nbsp; A helpful neighbor came out, and offered to jump my car.&nbsp; Long story short, I look away for a second, I look back, he has the cables cross-wired Pos to neg, with a little bit of smoke coming out!Luckily my battery was so dead that nothing caught fire, and after connecting the cables correctly I was able to jump my car and be on my way.&nbsp; Only damage I&#039;ve noticed is that the radio no longer works.&nbsp; The car drives fine, cruise control/dash work, etc, just no clock/radio.&nbsp; I checked the fuse and it was fine.Fast forward to today, I decided to replace my (assumedly) broken radio.&nbsp; I wired up a harness, plugged in the radio, and nothing, no power.&nbsp; I worked off of this manual: <a href="http://www.nicoclub.com/FSM/Sentra/2010/AV.pdf" target="_blank">http://www.nicoclub.com/FSM/Sentra/2010/AV.pdf</a> for my 2010 Nissan Sentra.&nbsp; I did some debugging with a volt-meter, and what I found is that while ACC (page 14 pin 7) reads a normal 12v with the key set to ACC, BAT (page 14 pin 19) only reads ~1.1-1.2v.&nbsp; I&#039;m thinking this is why the radio won&#039;t power on.&nbsp; I checked the harness I built and the resistance is low on both connections, but with BAT reading only 10% of the expected voltage.Any ideas or suggestions?</blockquote>

[QUOTE="CrazyNorman, post: 8387013, member: 665993"] I'm pretty sure I know what caused this problem, but I have no idea how to approach fixing it. This winter, I went out one day, and my battery was dead. A helpful neighbor came out, and offered to jump my car. Long story short, I look away for a second, I look back, he has the cables cross-wired Pos to neg, with a little bit of smoke coming out! Luckily my battery was so dead that nothing caught fire, and after connecting the cables correctly I was able to jump my car and be on my way. Only damage I've noticed is that the radio no longer works. The car drives fine, cruise control/dash work, etc, just no clock/radio. I checked the fuse and it was fine. Fast forward to today, I decided to replace my (assumedly) broken radio. I wired up a harness, plugged in the radio, and nothing, no power. I worked off of this manual: [URL="http://www.nicoclub.com/FSM/Sentra/2010/AV.pdf"]http://www.nicoclub.com/FSM/Sentra/2010/AV.pdf[/URL] for my 2010 Nissan Sentra. I did some debugging with a volt-meter, and what I found is that while ACC (page 14 pin 7) reads a normal 12v with the key set to ACC, BAT (page 14 pin 19) only reads ~1.1-1.2v. I'm thinking this is why the radio won't power on. I checked the harness I built and the resistance is low on both connections, but with BAT reading only 10% of the expected voltage. Any ideas or suggestions? [/QUOTE]

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