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89 civic, head unit power wiring

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Member - Posts: 3
Member spacespace
Joined: December 26, 2006
Location: Australia
Posted: December 26, 2006 at 9:51 PM / IP Logged  

im just wondering, and i have noticed this thru observation, that the constant 12V+ wire from most head units supplies the unit with all its power and keeps the memory alive, and the red ACC+ wire is just to turn it on and off with the ignition, just like an amps remote wire. Is this right? Because I have a Kenwood head unit that is 200W and I had some leftover #10 from doing my amp install so i ran it from the battery with a 15A fuse, to the constant wire and just hooked the ACC+ wire to the cigarette lighter positive that is switched by the key. It sounds better than it did when i was running it off of a clock wire. Because i had the stereo going and i pulled the clock fuse and the stereo shut off, but the ignition was on and there was power at the ACC wire. so i think im right but if im not tell me. and do all head units pull all their power from the constant?

anyways thanks for the info

Platinum - Posts: 5,053
Platinum spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: January 19, 2003
Location: Michigan, Bouvet Island
Posted: December 26, 2006 at 9:54 PM / IP Logged  
Not all will be powered that way. Most higher powered units will be powered like this, but it is really up to the manufacturer, and the decisions made during development of the HU.
It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."
Member - Posts: 1
Member spacespace
Joined: January 25, 2007
Location: New Zealand
Posted: January 30, 2007 at 10:52 PM / IP Logged  

I have tried to connect up a SONY CDX-GT250S in to a Honda Civic 89 I double checked everything and made sure that nothing was left to chance and tried to switch on the HU and no power no nothing. My power wires are larger that the current ones that ran the factory unit does that mean anything?

"when connecting this unit in combination with other stereo components, the connected car circuits rating must be higher that the sum of each components fuse."

Can someone enlighten me as to what this means. also I read

"when no car circuits are rated high enough connect the unit directly to the battery"

Im guessing here that My HU might be in the class where a direct line to the battery is required. Can I get any more help on this one?

thanks in advance

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