injectors not getting power 85 900
 

i have a manual trans 1985 900 turbo and the car used to start but it sat for a while and i payed someone to put a alternator in and since then it has not ran. its getting spark, it cranks but the injectors are not getting power. i have replaced all injectors, the pressure regulator and the fuel pump. i dont know a lot about saab electrical systems and i was wondering if there is anything that could be preventing them from getting power? i dont know what sensors or modules ect. that can be preventing a signal to the injectors. all fuses and relays have been checked