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Have 2001 Tribute, checked battery and alternator with DVM.

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No alternator output voltage, Can...
Have 2001 Tribute, checked battery and alternator with DVM. No alternator output voltage, Can jump start with portable battery charger. Voltage will rapidly drop from @ 12.75 vdc, to @ 8.85 vdc, then engine will shut down. Alternator is @ 18 months old, kicker is the alternator indicator light never comes on except upon ignition key switching to accessory. Is there a possible problem in the wiring electrical components, the alternator fuses were pulled and tested good with the DVM ( @ 0.4 ohms).
Submitted: 1 year ago.Category: Mazda
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Answered in 4 minutes by:
5/28/2016
Mazda Mechanic: roybelding, ASE Master Tech replied 1 year ago
roybelding
roybelding, ASE Master Tech
Category: Mazda
Satisfied Customers: 6,340
Experience: 40 years experience ASE master tech
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good morning my name is ***** ***** I will assist

first, nothing will work with 8.85 battery voltage. you need to charge it to 12.6 volts and then re test.

the alternator will work if it can once it has 12 volts to activate it.

lets start there and then re test

Roy

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Customer reply replied 1 year ago
If the battery sits without starting vehicle it will build up to @ 11 6 vdc on its own, not enough to start it. Hooking up portable charger will start vehicle. Disconnecting charger will leave battery voltage @ 12.4 to 12.27 vdc, volage will not climb to @ 14.5 vdc at battery terminals. in @ 5 minutes voltage at the battery terminal will start dropping, until it is low enough to kill the engine.
Mazda Mechanic: roybelding, ASE Master Tech replied 1 year ago

ok, with the battery being dead, the voltage will not build due to high amperage, if the alternator is working. it sounds like it is not but with a very low battery such as you have the testing is in accurate until your battery is up to voltage.

Roy

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Mazda Mechanic: roybelding, ASE Master Tech replied 1 year ago

how are you making out

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Customer reply replied 1 year ago
going to have the battery tested for damaged cells and load. will be back in @ an hour. what is the expected readings for the diodes, and the positioning? Also are they protective for the charging circiut?
Mazda Mechanic: roybelding, ASE Master Tech replied 1 year ago

yes they are. at this point get the battery up to charge and then we will do testing. we will check with volt meter for charging and ripple on the diodes

Roy

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Customer reply replied 1 year ago
just returned with battery, tested good, placing it on the charger to build up voltage to @ 12.7 or a little higher.
Mazda Mechanic: roybelding, ASE Master Tech replied 1 year ago

ok, run the truck and see what the voltage is at battery

Roy

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Customer reply replied 1 year ago
it is charging now, unfortunately it will only run for 5 to 10 minutes.
Mazda Mechanic: roybelding, ASE Master Tech replied 1 year ago

what is the voltage???

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Customer reply replied 1 year ago
12.71 vdc, charger disconnected. figured on charging to @ 13.00 vdc.
Mazda Mechanic: roybelding, ASE Master Tech replied 1 year ago

not good. needs to be 14 to 14.5 volts on dc

switch to ac and see if there is any voltage that will check the diodes.

Roy

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Mazda Mechanic: roybelding, ASE Master Tech replied 1 year ago

how are you making out

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Customer reply replied 1 year ago
diode #1 closest to engine checked to positive 13.874 vdc both sides, checked to negative 0.00 vdc both sides
diode #2 closest to fender checked to positive 1.726 vdc one side 0.128 vdc other side, checked to negative
10.836 vdc both sides.
Mazda Mechanic: roybelding, ASE Master Tech replied 1 year ago

please stop measuring diodes. not needed at all.

is the charge rate 13.8 volts dc???

all you need to do to check the diodes is measure ac voltage at the battery. it should be 0 volts. thats all the testing you need to do

Roy

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Mazda Mechanic: roybelding, ASE Master Tech replied 1 year ago

please dont forget to rate me as it is the only way I get paid for my efforts

Roy

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roybelding
roybelding
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