Becker radio wiring question

[85cj]

I am replacing the Becker radio,i have the wires figured out by using a test light but i cannot find a ground wire.The previous owner removed the alarm system thinking he had a short killing the battery but it was the antenna,i can ground to body and all is ok but can not find one near the radio,any suggestions ?

[hangit]

Originally Posted by 85cj

I am replacing the Becker radio,i have the wires figured out by using a test light but i cannot find a ground wire.The previous owner removed the alarm system thinking he had a short killing the battery but it was the antenna,i can ground to body and all is ok but can not find one near the radio,any suggestions ?

I think all grounds are brown in color. At least on my 240D and 300SD.

John

[85cj]

Thats what i thought but my test light doesnt work from the ones that i see except off the lighter,i think it has wiring probems that im not smart enough to figure out,i know the ignition switch has to be turned just right to get the blower motor to work,i may just run a ground wire myself if i can find a good place..thx