View Full Version : Power sources for aftermarket HU
LondonRS4
08-04-2009, 10:49 AM
I've installed a Kenwood DNX7140 and am just waiting for UPS to bring the amplifiers to complete the setup. One annoyance is that I'm getting permanent power from the normal radio fuse (20A) and an ignition accessory voltage from another one of the wires in the fuse panel behind the driver's side dash removable panel.
Unfortunately both the permanent and ignition acc sources seem to be on the load reduction relay side of things, so when I actually start the car, the DNX restarts. Any suggestions as to where I can tap into a permanent 12V and a switched 12V which don't do this ? Wouldn't be so annoying if the DNX didn't take so long to reboot.
koolade9
08-04-2009, 11:57 AM
Didn't you just use an adapter harness to pull all needed leads directly from the factory harness??
diablooffire03
08-04-2009, 01:03 PM
Umm I think its normal for the unit to restart when turing over engine. I think majority of cars do this, atleast with an aftermarket HU
koolade9
08-04-2009, 01:18 PM
Umm I think its normal for the unit to restart when turing over engine. I think majority of cars do this, atleast with an aftermarket HU
Depends if there's enough of a voltage drop... Before my battery finally let go, my RNS-E would reload after turning over. I put a new battery in over xmas, and now my headunit will stay on without reloading...
diablooffire03
08-04-2009, 05:48 PM
Well I really dont think its a big issue, everycar ive owned has done this.
LondonRS4
08-05-2009, 05:18 AM
Depends if there's enough of a voltage drop... Before my battery finally let go, my RNS-E would reload after turning over. I put a new battery in over xmas, and now my headunit will stay on without reloading...
Has nothing to do with voltage drop. If I run a line directly to the battery, I have no problems. Also, the 12V in the quadlock is also switched.
I put my RNS-E back in and yes, it does the same thing. I think it's just 'cos the DNX takes 25 seconds to reboot that I'm noticing it now.
Retsujou
08-05-2009, 06:28 AM
Weird, my Car does not do that with the RNS-E. When I manually "start" the RNS-E, then turn the key and start the car, all continues as normal. NO restart, no hesitation.
Christian@enfig
08-05-2009, 07:23 AM
I've installed a Kenwood DNX7140 and am just waiting for UPS to bring the amplifiers to complete the setup. One annoyance is that I'm getting permanent power from the normal radio fuse (20A) and an ignition accessory voltage from another one of the wires in the fuse panel behind the driver's side dash removable panel.
Unfortunately both the permanent and ignition acc sources seem to be on the load reduction relay side of things, so when I actually start the car, the DNX restarts. Any suggestions as to where I can tap into a permanent 12V and a switched 12V which don't do this ? Wouldn't be so annoying if the DNX didn't take so long to reboot.
I have done a few installs where we connected the ignition wire to the dome light using a relay and diode so that the unit begins to boot as soon as you unlock the car. You get 30 seconds until it shuts itself off.
It may solve your problem if the problem is on the igniton side of things if you use the constant to feed the relay.
koolade9
08-05-2009, 10:39 AM
Has nothing to do with voltage drop. If I run a line directly to the battery, I have no problems. Also, the 12V in the quadlock is also switched.
I put my RNS-E back in and yes, it does the same thing. I think it's just 'cos the DNX takes 25 seconds to reboot that I'm noticing it now.
thank you for prooving my point...run everything off the stereo harness and not your igntion harness...my RNS-E doesn't reboot at ignition [;)]
LondonRS4
08-11-2009, 06:37 AM
BTW for all the people (including me) who say their RNS-E does (or did) not reboot after ignition, the reason is that it's the CAN gateway that controls its on and off state. There is a 12V permanent wire in the quad lock connector (red with blue stripe) and the CAN hi/low signals control when the radio goes on and off.
Unfortunately the Connects2 harness does not provide this functionality, even though it has all the wires in place to actually do so. So you have to wire the 3 Kenwood leads (permanent 12V, switched 12V and Gnd) directly to the car elsewhere.
If you want a solution, you could wire up a latched relay setup that would reset with door trigger
LondonRS4
08-13-2009, 09:32 AM
Pretty much what I did. Installed a 12V relay with variable on time delay after the ignition signal is removed. Have it dialed in for 10 seconds.
Christian@enfig
08-13-2009, 12:47 PM
BTW for all the people (including me) who say their RNS-E does (or did) not reboot after ignition, the reason is that it's the CAN gateway that controls its on and off state. There is a 12V permanent wire in the quad lock connector (red with blue stripe) and the CAN hi/low signals control when the radio goes on and off.
Unfortunately the Connects2 harness does not provide this functionality, even though it has all the wires in place to actually do so. So you have to wire the 3 Kenwood leads (permanent 12V, switched 12V and Gnd) directly to the car elsewhere.
???
The Connects 2 has Ground, Constant 12V & Switched Accessory 12V. But you want ignition 12V instead of Switched Accessory 12V.
I just want to make sure because what I just read above lead me to believe that they were not present.
(for those of you that don't know switched ignition stays on during the start sequence. Switched accessory turns off during the start sequence).
koolade9
08-13-2009, 01:11 PM
(for those of you that don't know switched ignition stays on during the start sequence. Switched accessory turns off during the start sequence).
Boom! Roasted.
LondonRS4
08-30-2009, 03:22 PM
???
The Connects 2 has Ground, Constant 12V & Switched Accessory 12V. But you want ignition 12V instead of Switched Accessory 12V.
I just want to make sure because what I just read above lead me to believe that they were not present.
(for those of you that don't know switched ignition stays on during the start sequence. Switched accessory turns off during the start sequence).
Yes, sorry I wasn't totally clear. If you read my build thread in the Enfig hosted forum http://www.audizine.com/forum/showthread.php?t=304941 you'll see that I chose to run 12V and Gnd all the way from a common distribution block in the back of the car to the Kenwood HU. The same block that supplies my 2 DLS amps and Alpine H650. That eliminated a ever so small whine I heard when using the Connects2 harness 12V and Gnd leads. I suspect if someone was using the stock Bose amp in the back or the amps in the Kenwood HU, the Connects2 12V and Gnd would be just perfect.
The thing I really wanted to have was a lead that was 12V in the ACC or IGN positions. As I've pointed out (and you have too) the IGN position triggers a load dump relay that disconnects all the accessories to ensure maximum current to the starter. Unfortunately that also means another 25s wait while the DNX7140 reboots yet again. I solved it with a delay on break relay, but there was probably a simpler place to get a hot wire that I don't know about. It's just a small annoyance of the long startup time of the DNX7140. DOn't know if the other DNX series are better or worse.