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sprinkles08, ASE Certified Technician
Category: Mazda
Satisfied Customers: 21601
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
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Radio and door locks aren't working after alternator

Customer Question

Radio and door locks aren't working after alternator replacement ,hoe can I fix?
Submitted: 3 months ago.
Category: Mazda
Expert:  Don 'Mo Lurch' replied 3 months ago.


Customer: replied 3 months ago.
2002 Mazda tribute 3.0L V6 autotrans
Customer: replied 3 months ago.
Is it my turn
Customer: replied 3 months ago.
How do i Fix
Expert:  Don 'Mo Lurch' replied 3 months ago.

sorry for the delay............
Greetings...... “Hi, I’m Don (aka MOLurch) and I look forward to helping you!”
There are only 2 circuits that are common to the Alternator.
Not sure what happened when the Alternator was replaced, if the Battery was disconnected when the replacement was done.
Please Test Voltage + on "both sides" of Fuses "11" & Fuse "12' with key ON, located in the Inside Fuse Panel
Click Attachment below
Let me know what you find

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Customer: replied 3 months ago.
I have to get volt meter be back in 30
Expert:  Don 'Mo Lurch' replied 3 months ago.

not a problem.........

let me know if you need further...........

Customer: replied 3 months ago.
OK I'm back I have power on 11 no power on 12
Expert:  Don 'Mo Lurch' replied 3 months ago.

Key ON?
No Voltage + on either side of Fuse 12?
Voltage + on "both sides" of Fuse 11?

Customer: replied 3 months ago.
Expert:  Don 'Mo Lurch' replied 3 months ago.

is there any Display on Radio?
Clock show?

Customer: replied 3 months ago.
No ,No
Expert:  Don 'Mo Lurch' replied 3 months ago.

The only correlation I see with the Alternator & Radio / Locks is the GEM (general electronics module), fuse 11 & fuse 12
Unless there are other components that are not working that were not posted (seats, mirrors, cluster, etc)
Fuses 19, 20, 21, 26 & 27 power other components & Fuses 11 & 12
Main Fuse under hood 120amp
Click Attachments below
Test Fuses with Key ON
IF ALL show good, let me know, & I will OPT OUT & Relist this to see if someone else has more info

Customer: replied 3 months ago.
They all check out. The car runs everything works except radio and locks. Locks work when car is running. What is the module your talking about for 11?
Customer: replied 3 months ago.
Or 12
Expert:  Don 'Mo Lurch' replied 3 months ago.

What is the module your talking about for 11?


GEM.........that is the Fuse Panel
It contains Circuit Board & non replaceable Internal Relays.
I will OPT OUT & Relist, as Mazda Schematics are not the best.......
Do not respond to this, as it will Lock Question
IF someone else can help, they will post here


Expert:  sprinkles08 replied 3 months ago.

Hello and welcome to JustAnswer!

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