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04 crown vic not charging. Changed alternator and computer.

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04 crown vic not charging...
04 crown vic not charging . Changed alternator and computer. My son has same car coming up with different voltages on alt. wire connecter
Submitted: 3 months ago.Category: Ford
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Answered in 3 minutes by:
3/17/2018
Ford Mechanic: roy, import/domestic specialest replied 3 months ago
roy
roy, import/domestic specialest
Category: Ford
Satisfied Customers: 7,602
Experience: ASE master tech for 40 years
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hello, my name is ***** ***** I will be glad to assist you. please allow me a couple of minutes to gather some basic info.

Roy

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Ford Mechanic: roy, import/domestic specialest replied 3 months ago

ok

what are the voltages and where is he checking them??

Roy

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Customer reply replied 3 months ago
the three wire plug on alt , should car be running or off
Ford Mechanic: roy, import/domestic specialest replied 3 months ago

running

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Customer reply replied 3 months ago
8.3 on small yellow 12 on green 12 on big yellow
Ford Mechanic: roy, import/domestic specialest replied 3 months ago

what is the voltage at the battery with the engine running

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Customer reply replied 3 months ago
12
Ford Mechanic: roy, import/domestic specialest replied 3 months ago

does the fat wire at the back of the alternator have battery voltage??

Roy

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Customer reply replied 3 months ago
12
Customer reply replied 3 months ago
ign. off small yellow 0 green 0 large yellow 11.92 ign. on small yellow 8.3 green 0 large yellow 11.21
Ford Mechanic: roy, import/domestic specialest replied 3 months ago

engine running 11.9?? your battery is dead. it needs to be 12.4 volts at least. it will not function under 12 volts

Roy

all tests with engine running

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Customer reply replied 3 months ago
I'm charging now
Ford Mechanic: roy, import/domestic specialest replied 3 months ago

charge it up until it is between 12.4 and 12.6

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Customer reply replied 3 months ago
batt at 12.6 started engine small yellow 8.6 green .02 large yellow 12.2
Ford Mechanic: roy, import/domestic specialest replied 3 months ago

is this with the connector removed???

if it is, hook it back up and see what the charge rate is with it running at the battery

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Customer reply replied 3 months ago
went down to 11.86 at battery when running
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