I have a 2002 mazda protege5 put new alernater on and battery tested good still not charging.

Asked by Apr 16, 2017 at 08:30 PM about the 2002 Mazda Protege5 4 Dr STD Wagon

Question type: Maintenance & Repair

7 Answers

75,545

Check for bad wires to the alternator, also look for a blow fuse related to the charging system.

Best Answer Mark helpful

I did and I could not find any bad . I also checked for voltage coming from the output post on the back of the alternator there is none. Is it possible the new alternator is bad?

75,545

Good morning Brian, it is possible the new alternator is not working, but you would want to eliminate some other possibilities. With the engine running at idle, check at the battery with your digital multi meter to see what the voltage is. At the battery it should read around 14.5-DCV. If your not getting that, check continuity of the large output wire from the alternator to the B+, a lot of times there is a fuse-able link in that line that could be burnt out.

when unhook the large wire from output post on alternator and check voltage at that post I have nothing.

75,545

You would have nothing at the alternator post. It is in the wire you should have showed battery voltage.

I think I have a computer issue the computer tells the alternator to charge. alternator tested good as well as battery. I don't think I have a short because I drove car about 6 different places in about 5 miles and still had about 12.15 volts in it when we got home. starting car each time. They don't make a repair manual for this car. all fuses are good. That i could find.

75,545

12.15 DCV is showing the battery is discharging. The battery should have a minimum of 12.5 DCV if the alternator, charging system was working. Did you check for voltage at the main wire that runs to the alternator? There should be battery voltage there. As a matter of fact you did check..." I also checked for voltage coming from the output post on the back of the alternator there is none" ...There should be battery voltage on that wire.

Your Answer

Protege5

Looking for a Used Protege5 in your area?

CarGurus has 15 nationwide Protege5 listings and the tools to find you a great deal.

Postal Code:

Mazda Protege5 Experts

  • #1
    Paul Wilson
    Reputation
    190
  • #2
    MazdaPro5
    Reputation
    180
  • #3
    Tyler Agnew
    Reputation
    90
View All

Related Models For Sale

Used Mazda Protege
23 listings
Used Mazda MAZDA6
24 Great Deals out of 597 listings starting at $950
Used Acura TL
19 Great Deals out of 248 listings starting at $3,995
Used Toyota Corolla
267 Great Deals out of 4,285 listings starting at $1,400
Used Hyundai Accent
92 Great Deals out of 1,572 listings starting at $700
Used Honda Civic
326 Great Deals out of 3,631 listings starting at $1,495
Used Honda Civic Coupe
79 Great Deals out of 944 listings starting at $799
Used Subaru Impreza WRX
71 listings starting at $8,490
Used Subaru Impreza
42 Great Deals out of 809 listings starting at $500
Used BMW 3 Series
165 Great Deals out of 1,927 listings starting at $2,500

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.