How do you test an alternator while it's in the jeep for proper operation?
To make sure it's putting out the right voltage and not over charging the battery.
Should be what 14v or something like that? Is it constant?
I swapped in a 124amp CS144 from a caddy and I know I had issues with the old battery but I want to eleminate the alternator as the cause.
Especially since I just picked up a Red top optima. $145
A "12 volt" battery actually is 6 cells producing 2.2 volts per cell for a total of 13.2 volts when fully charged.
The easiest way to check your alternator is to do a voltage test at the battery posts,
BEFORE you start the engine, when the voltage will usually be around 12.5 to 12.9 volts.
Then again AFTER you start the engine and let it run a little bit (Recharging the battery from starting),
You will see the voltage rise to about 14.5 volts.
If your alternator produces more than 14.5 volt at any time, it's OVERCHARGING.
If you don't read any more voltage than you had before you started the engine, the alternator isn't charging...
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Now, for the Delco CS alternator 'Upgrade'....
Did you use a different resistor in the 'Excite' wire to the CS alternator?
Or did you use a 'Pig Tail Adapter' that had the resistor built in?
If you DID NOT use a resistor (about 75 Ohms at 1/4 to 1/2 Watt) then your CS series alternator isn't long for this world, and it will do STRANGE THINGS while it's 'Working'...
Without the added resistance (Factory Jeep/Delco SI alternators use a 10 to 15 Ohm resistor) and you need at least 35 Ohms MINIMUM to keep the CS series alive!
75 Ohms will keep them charging at VERY LOW RPM...
SO! Get back to us with the information about the 'Adapter' and resisted 'Excite' circuit wire and we can help you better!
(NEVER FORGET! NOTHING YOU DO WILL HELP YOUR CHARGING SYSTEM MORE THAN A DEDICATED 10 Gauge GROUND WIRE TO THE ALTERNATOR!)