924Board.org

[ATL_racer]

I have power and ground to the wiring harness for my headunit and it wont work. I thought maybe the headunit was dead, so i returned it and got a new one, and it still wont work. My power line is hot and my ground wire grounds....why wont it turn on?

How did yall wire the headunits in your car?
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late 1979 porche 924, red 2.0l NA 5speed snailshell
Plans: Restore exterior, revitalize interior, install killer sound system, run engine in stock form and have fun.(+ a short throw shifter if i can find one)

[crazyinkc]

Do you have +12V when you try to power up the unit? If you have +12v off then it drops when you try to turn it on, you have a corroded fues connection or a bad wire to the radio. Do you have all power wires hooked up (Constant and Switched)? Don't forget brown in the car is ground!

[Mavfan]

just pay the $20 for best buy to install it, they'll take care of anyproblem like that. thats exactly what happend when i tried to install a headunit in my 944.
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Black 1988 924S SE
Red 1985.5 944

http://mavfan72.tripod.com/
http://www.cardomain.com/id/mavfan

Video:
http://video.google.com/videoplay?docid=-5193982457901018136

[WhoDak]

Nooooooo don't have best buy or some associated chain shop do it. I think they would have killed themselves installing it in my car with the hack job wiring that was there from some PO. I'd rather have the satisfaction of knowing it's done right, and well and learn something in the process.

If you've got a multimeter mine helped me out quite a bit here. There's a constant 12v(?) source that's always on(for the clock and settings), and then there's the 12v that's on with the key in. You probably need both of those, though I'm not positive.
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Mike
'82 924 N/A
'91 Toyota Pickup SR5 4x4 Xtra cab

[leadfoot]

Whodak your spot on the money...you need two 12V sources for power, one constant 12V run through an inline fuse to the battery and one 12v routed through the ignition. These are normally coloured red and yellow. Black will be the ground wire and this goes to the chassis.
Make sure you haven't blown the fuse on the back of the head unit when installing it and check the fuse from the igniton line if you are using the origional radio line that the fuse in the fuse box isn't blown.
Refer to your installation manual that came with the head unit for the wiring colours.
Leadfoot
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1981 ROW 924 Turbo -
carbon fiber GT mish mash
LS1 conversion in progress...

[Mavfan]

meh, well actually who dak, there was some sony (i believe) headunit in there previously, and you could NOT believe all the wiring left behind, it was crazy, i had no idea where to begin, so i took it there, and it was done in 10 minutes... simple, easy and well worth the $20 knowing that it WAS done right! but to each their own. i was just tired of trying to do it myself. especially since the headunit just as alt_racer described would not turn on. although i didn't multimeter it, which now seems like an obvious place to begin...
_________________
Black 1988 924S SE
Red 1985.5 944

http://mavfan72.tripod.com/
http://www.cardomain.com/id/mavfan

Video:
http://video.google.com/videoplay?docid=-5193982457901018136

[Vince Ponz]

If your car is a later car look and see if your wires are banded to the back of the headlight. If it is most likely the wires broke inside the harness. My sons 924S had one headlight that worked and one did not. We removed the tie wrap and the wires went limp. Cut and reconnected the one side and now all is well.
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"Never let them see you sweat"
77.5 924 modified track car
79 931 Euro stock
88 924S SE
87 911 Targa stock

[ATL_racer]

[leadfoot]

Any electrical work would not be half as easy without a multimeter (especially one with a continuity tester)
Well done on the install....
You can send a cheque to : leadfootsgamblingfund@betitallonred.com
Leadfoot
_________________
1981 ROW 924 Turbo -
carbon fiber GT mish mash
LS1 conversion in progress...