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Old 06-04-2005, 02:06 PM
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battery drain?

on my 62 galaxie when i shut the engine off after 48 hrs the battery is dead. I did the alternator conversion (ford 65 amp)w/ external transpo ss electronic regulator mounted on the back all connections are tight as is the new belt, when running i measure 14.2 volts at the battery. i checked w/ an ammeter (dvom) between the bat pos post and the bat cable an measured 001 ma i was told thats not enough to cause bat drain. Any ideas were to go next? should i check ( amm test) w/ a 12v test light? thanks mike

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Old 06-04-2005, 09:40 PM
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how old is the battery a car batt can only be drained dead a few times and it will go septic that is the difference between a deep cycles and a car battery
try taking the positive batt cable off and touch it to the post in a darken area see if there is a spark if there is something is drawing go to the fuse box and pull on @ a time if still nada then check your alt set up might
check that 1st let me know how you make out


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Old 06-05-2005, 03:01 AM
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Put a test light between the pos post and pos cable. If it comes on you have a short. If there is no short. Remove battery cable and leave car for 48 hrs. See if battery is dead.

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Old 06-05-2005, 03:13 AM
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Put a test light between the pos post and pos cable. If it comes on you have a short.
Well, not a short but a current draw. On a late model car, if you come across current across the postive terminal as described, you would simply remove fuses (fuse box) from each circuit until the lamp goes out. Then you have found the drawing circuit (say a glove box lamp that will not cut off or a bad clock).

The first thing that would concern me is the condition of the battery. I would subject it to a deep draw test and if good bring it back to a full charge with a slow charge. Then I would test the charging system under load. You can do this easily by turning on all the accessories you have (not many on a '62).

Finally, isloate the alternator from the circuit (unhook) and if test light goes out, you have a bad diode(s) in the alternator.

Where did you get your alternator harness? Are you sure it is wired correctly?
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Old 06-05-2005, 08:03 PM
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Doc here,

Since you have already done a "Drain Evaluation", and are pulling less then 3 MA..It rules out what I normally would advise..that would be a faulty (New or Not ) Diode pack in the alternator or regulator...(OBF's are quite Common in new equipment)

With no draw in evidence, I would then say Load test the Battery for bad cells..

Also, Sitting static (not running) is the power less then 11 volts? If so, you have bad cells.

Also CHECK the battery terminals for corrosion at the battery, just because you can read 14.4 at the battery CABLES it doesn't mean it's actually transferring into the battery...which would also hose up your start functions.

ALSO, if the Battery was drained dead at some point, and remained there for a period of time...put a FULL charge (6 to 10 hours at 10 amps) from a BATTERY CHARGER...

An Alternator system, was not designed to, and will not bring a dead battery BACK from the dead ..

It was only designed to support the electrical system while operating..and may only be putting a surface charge back in, when you "Jolt it" with a high drain (starter motor) goes immediately dead..

Take the Battery to the local Auto parts store and have them do a free load test first, If it's good, then try the slow Charge..

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