1985 porsche 911 headunit
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=64526
Printed Date: June 10, 2024 at 5:27 AM
Topic: 1985 porsche 911 headunit
Posted By: lpsalsaman
Subject: 1985 porsche 911 headunit
Date Posted: October 17, 2005 at 12:49 PM
Have anyone installed an aftermarket unit on any type Porsche 911 1988 and earlier model? I have installed a unit to the correct cars factory wires, also checked the wiring diagrams here at this site for the car and unit. All checks okay but the unit looses its memory once the car key is turn to the off position. I was thinking to re-route the accessorie wire to a constant power source like the clock or the lighter in order to preserve the memory once the car is turned off. The Pioneer unit does not have a independent memory wire like most other units, it is just red power (battery) and yellow (acc). Besides that there is the one to the antenna but that's it. Does anyone has any suggestions on this? Thanks!
Replies:
Posted By: tcss
Date Posted: October 17, 2005 at 1:38 PM
You have your ignition and constant backwords.
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There is no such thing as free installation!
Posted By: Alpine Guy
Date Posted: October 17, 2005 at 1:47 PM
That, or that car isn't wired for a constant wire, it probably only has switched because it probably had a manual on off type radio. Just run a new fused wire from the constant 12v in the ignition, be shure to solder it.
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2003 Chevy Avalanche,Eclipse CD7000,Morel Elate 5,Adire Extremis,Alpine PDX-4.150, 15" TC-3000, 2 Alpine PDX-1.1000, 470Amp HO Alt.
Posted By: lpsalsaman
Date Posted: October 17, 2005 at 6:56 PM
You know, you both probably right since the original radio was an old din size with the "turn switch" type knob. I also remember that there was a fuse in the wire which seemed to be the battery. However, when I first installed the new head-unit the fuse blew and I omitted it. What do you think about placing the head-unit accessories wire "piggy backing" from the cars clock?
Posted By: Ween
Date Posted: October 17, 2005 at 9:42 PM
hi, if the unit you installed is a high power unit, it would be just as easy to bring a wire through the firewall and connect it to the fusebox on the driver's side of the trunk. there should be a milky white plug (1/2 inch or so in diameter) to the right of the radio, behind the glovebox area. you can use that plug as a hole (grommet) through the firewall. at the fuse panel, the fuses toward the rear of the car are constant power. hope this helps. mark
Posted By: lpsalsaman
Date Posted: October 18, 2005 at 5:49 AM
You know what Mark, I think you got something here. I did saw some plugs (grommets) on the back of the firewall when I de-installed the original radio. The access to the main fuse panel from there is easy, I think that running a wire to it should be fine and clean. So, on this case running the red wire on the head-unit which is for accessories should be fine. What you'll think?
Posted By: Ween
Date Posted: October 18, 2005 at 6:53 AM
check your wiring for the headunit as tcss suggested, red is usually switched power, yellow constant.....although way old pioneer's used orange for constant and red for switched. make sure to use the same gauge or slightly bigger wire for the connection. and i'm pretty sure the top row side of the fusebox is the hot (unfused) side. if you tap in there, may want to add an additional fuse. or use the cold side of the fuse box. mark
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