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1994 Mazda Protege New battery and altenator and battery st

Tiny
JCSRT8
  • MEMBER
  • 1994 MAZDA PROTEGE
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 240,000 MILES
I had my belts replaced because one popped and every since then the altenator has not been charging the battery. It will run for 4 days and then the battery dies. Ive went thriough 3 altenators and the results are the same. The shop says the altenator is charging, but a few days later the car and I are on the side of the road. New battery, new altenator, new connectors and it still dies! I dont know what else to do, please help, Thanks, JC
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Friday, January 8th, 2010 AT 3:10 AM

8 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Is there 12v+ on all three wires off ALT engine running?
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Friday, January 8th, 2010 AT 1:31 PM
Tiny
JCSRT8
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  • 5 POSTS
On the battery yes, its new. What do I need to test on the Altenator, its new as well.
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Friday, January 8th, 2010 AT 1:40 PM
Tiny
DOCFIXIT
  • MECHANIC
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Take voltage reading on wires at ALT also across batt terminals engine running. Does charge light on dash come on before start then go out?
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Friday, January 8th, 2010 AT 1:44 PM
Tiny
JCSRT8
  • MEMBER
  • 5 POSTS
No, the charge light doesnt come on at all upon start up and I need to get a new reader because I think somethings wrong with this one. Im gonna run to autoparts store and grab a new so I know im getting acurate reading to relay back to you.
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Friday, January 8th, 2010 AT 1:53 PM
Tiny
DOCFIXIT
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  • 18,828 POSTS
Check 15 amp Meter fuse left side I/P
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Friday, January 8th, 2010 AT 2:00 PM
Tiny
JCSRT8
  • MEMBER
  • 5 POSTS
The altenator has the same volts as the battery, 12v while off and running, so the altenator is not charging. Its new and has been tested and so is the battery. The altenator has two connecting cables, the power suppy line, which has a bolt to screw on and a plug in connector, thats it. I tested the voltage on the plug in as well and it reads the same as the battery on one of the two teeth, but the second one gives no reading. I checked the 15A meter fuse and its good as well as all the other fuses in the car. I dont know what else to look for and the only thing thats not giving a reading is one of the two connectors inside the plug itself and im not sure if both should give a reading anyway. Im lost on this one!
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Sunday, January 10th, 2010 AT 11:32 AM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
The second oone that has no voltage is the one comming from dash charge light. When key is on before start voltage flows from fuse through light and grounds at alt. This is exciter for alt to start producing once engine is started voltage flows out on wire removing ground from light it goes off. Problem in dash or wiring to and from to alt.
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+1
Monday, January 11th, 2010 AT 8:05 AM
Tiny
JCSRT8
  • MEMBER
  • 5 POSTS
To and from the dash is causing the altenator not to charge? What are my options or what do you recommend?
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Monday, January 11th, 2010 AT 9:25 AM

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