Radio Power weird - short?

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Newbie
Joined
Sep 30, 2023
Points
3
Hello!

Years ago I replaced the stock radio with a pioneer radio, and it recently died. So I bought a new fancy CarPlay enabled radio and figured it would be a quick swap. I was wrong.

It appears that maybe the radio didn't die, and maybe it's some power issue somewhere. After installing the new radio it didn't power up so I checked the voltage on the constant and ignition lines. The constant is showing about 4.5v, and the ignition is about 4.1 when powered on, and -8v when powered off.

I assume there's a short somewhere. Anyone know of any common places a short might occur or does anyone think it might be some other issue?

Thanks for any help or pointers you can give!

--Eric
 

Rudyrov

Zorg Guru (I)
American Zeds
Joined
Jan 29, 2014
Points
95
Location
Phoenix, AZ
Model of Z
2.8 L Roadster
Sounds like you have some bad connections and or switches, you should probably trace the wiring harness back to a point where you have battery voltage like readings.
 

NZ00Z3

Zorg Guru (IV)
Supporter
New Zealand Zeds
Joined
Dec 9, 2014
Points
158
Location
Timaru, New Zealand
Model of Z
3.0L, 2.8L, 2.0L Z3 Roadsters
Find the electrical trouble shooting drawings for your build date. They are in the "Resources" section of this forum.

Work back along the power supply wires until you hit battery voltage.
 

Ancient Brewer

Regular Member
British Zeds
Joined
Mar 31, 2019
Points
18
Location
Dulverton
Model of Z
Z3 2.8 Roadster
I have a similar problem ; 3 years ago Halfords fitted a pioneer AVH-Z7100DAB in my 1999 Z3 2.8.It worked fine to start with but then started turning off and closing unexpectedly . This has got progressively worse and now the radio hardly turns on and off at all. I've just checked the yellow and red power inputs and they are giving me 3.9 -5 volts . Now have to trace back along the power lines as I assume there's some sort of random short somewhere . Any suggestions about likely culprits would be welcome.
 
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