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<blockquote data-quote="black02z" data-source="post: 8218742" data-attributes="member: 659478">Hey everyone, new user here. Ive learned a lot reading these forums without ever having to post but now I&#039;m looking for some help with a problem I&#039;ve never dealt with before.I was installing a Dual XD250 head unit (not my suggestion) for a friend in his 2005 Nissan Altima with the base audio package. I wired it up normally, turned the key on and everything works how it&#039;s supposed to.Now here&#039;s where the problems start. When I go to start the car, all the settings reset as the head unit loses it&#039;s memory. So I grab my multimeter and start checking the wiring. Key on, the fused yellow wire has battery voltage (fuse is good), when starting the engine the voltage drops to approximately 9v, the black wire is always grounded, but the red wire completely loses it&#039;s power, 0v, when cranking the engine over. As soon as the car is running everything works normally until the car is started again.I&#039;m at a loss as to why the head unit resets every time even though the yellow wire maintains it&#039;s voltage and should be responsible for maintaining the memory. I know it&#039;s a cheap head unit, is it possible there&#039;s a problem with the head unit internal memory? If anyone has any suggestions, I would really appreciate it.Thanks</blockquote>

[QUOTE="black02z, post: 8218742, member: 659478"] Hey everyone, new user here. Ive learned a lot reading these forums without ever having to post but now I'm looking for some help with a problem I've never dealt with before. I was installing a Dual XD250 head unit (not my suggestion) for a friend in his 2005 Nissan Altima with the base audio package. I wired it up normally, turned the key on and everything works how it's supposed to. Now here's where the problems start. When I go to start the car, all the settings reset as the head unit loses it's memory. So I grab my multimeter and start checking the wiring. Key on, the fused yellow wire has battery voltage (fuse is good), when starting the engine the voltage drops to approximately 9v, the black wire is always grounded, but the red wire completely loses it's power, 0v, when cranking the engine over. As soon as the car is running everything works normally until the car is started again. I'm at a loss as to why the head unit resets every time even though the yellow wire maintains it's voltage and should be responsible for maintaining the memory. I know it's a cheap head unit, is it possible there's a problem with the head unit internal memory? If anyone has any suggestions, I would really appreciate it. Thanks [/QUOTE]

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