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Marty, Mercedes Technician
Category: Mercedes
Satisfied Customers: 53904
Experience:  Bosch Certified Master Tech. Over 35 years experience.
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Not getting 12 volts at fuse one. Stereo does not turn on.

Customer Question

Not getting 12 volts at fuse one. Stereo does not turn on . Acc side has power from fuse 4
JA: Have you checked the fuse?
Customer: Looks good , no volts at either side
JA: What is the model of your '12 Mercedes?
Customer: 82 300d turbo
JA: Are you fixing your Turbo yourself? What have you tried so far?
Customer: Pulled stereo out of dash checked power going to my xm satellite which works be the head unit does not power up for stereo
JA: Anything else you want the mechanic to know before I connect you?
Customer: Check at fuse block fuse 4 has 12 volts but not at fuse 1
Submitted: 10 months ago.
Category: Mercedes
Customer: replied 10 months ago.
Sure a wiring diagram would answer my question
Expert:  Marty replied 10 months ago.

Hi, my name is***** 1 gets power from the headlight switch when it is turned on. Not sure what you are trying to do but you won't have 12V at fuse one until you turn the headlights or parking lights on. If you have no power at the fuse with the lights on you probably have a bad headlight switch.

Expert:  Marty replied 10 months ago.

Click the attachment for the wiring diagram.

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Expert:  Marty replied 10 months ago.

Just checking in. Do you need anymore help with this? Was the information helpful?