I am trying to install a 1994 clarion PU-9903A radio cassette in my 1997 saab 9000, with the two cable connectors inserted in the appropriate sockets and power present ( the display is lit ), there is no output to the four speakers. Is it a compatability problem ?

This is a tough one, i do this all the time for customer cars but you would need to prove ownership of the radio. the only way to get the code is through the dealer, you can try on the phone but most times they want proof, you will need the serail # off the radio you need the code for and some id and then heres the bad part, you need the registration for the car the radio came out of or title, or again try over the phone and tell them you need the code for radio just have the serail # also depending on the radio it may need to by connected as some radios they have you push andd hold two buttons to get a diffrent code they use to cross into the correct code. give it a try, good day.

any radio that is the same size will fit you can buy adapters at most radio shops best buy future shop adaptor uses vehicle wiring and connects to radio find a radio you like then ask for the adaptor to fit

hope this will help you hope you find a radio you like plz vote or comment reply if you need more help

It sound like an alternator problem , low voltage.

The code is not on the radio
To get code go to intstant radio code uk

1994 Saab 9000 Series Stereo Wiring Constant 12V+ White/Blue Switched 12V+ Yellow/Red Ground Black Illumination Brown/White Dimmer n/a Antenna Trigger Green Antenna Left Rear Front Speakers 6 1/2" Side Panels Left Front (+) Blue/Green Left Front (-) Gray/Black Right Front (+) Red/Green Right Front (-) Brown/Black Rear Speakers 6 1/2" Rear Deck Left Rear (+) Blue/Yellow Left Rear (-) Gray/White Right Rear (+) Red/Yellow Right Rear (-) Brown/White

Visit http://www.radio-code.com/index.htm

and follow the site instruction and uou will have to pay but can keep till it occurs again when you remove battery connector.

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Make sure all your injector connectors are clean and not corroded. make sure you have the correct resistor sparkplugs. And if both of those things are okay you probably have a bad direct ignition cassette.

CLARION code entry instructions can be found here
Select your model from this long list
http://www.radio-code.co.uk/code-entry-help-Clarion.htm

If this stereo is a clarion and original equipment and uses a a four digit code. First thing you do is with the power on to the radio, push and hold the band button for a few seconds until you see the word "code" on the radio display. Input the code and radio should work. If that doesn't work, then if you have tried to input a wrong code several times then radio will lock out. So what you need to do is
the radio has to be on for one hour uninterrupted, then you can do the band button procedure , code input again and hopefully the radio goes on. Hopefully this helps. Please advise results
.

The dealer can get those for you.