Battery charge

[edersonzir]

Hello;

I installed two new batteries in my jeep, but the problem is that they are staying without load in less than 15 days. As I drive only sometimes my MV, then I would like knowledge to make the test to discover if the dynamo it's ok our no.

Tank's a lot for all.
_________________
EDERSON ZIER
MVPA MEMBER #32056
Willys Overland MC M38 - 1950
Willys Overland CJ5 - 1966
M100 - 1951

[wesk]

You'll need a digital VOM (Volt-Ohm-Meter).

Charge both batteries fully. Each should read at least 12.5 volts. Reinstall the batteries and connect them. They should now read a combined voltage of 25 to 25.5 volts.

Leaving your VOM connected to the plus terminal on your cowl battery and a body ground (it will stay connected here thru the entire process). Start your engine. The voltage should drop to about 22 volts while cranking and after the engine starts it should climb back to about 25.0 volts. Now accelerate the engine to about 2000 RPM and the VOM should read 27 to 28.5 volts. If it still reads 24 to 25 volts it is not charging.

If this is the case the next task is to isolate the problem.

First check all electrical connections for corrosion and tightness. This includes the battery cables.

Check the system again. If still not charging it's time to determine if the fault lies with the generator or the regulator.

With everything off. Disconnect the cable assembly that connects the regulator to the generator at the end at the regulator.
Momentarily jumper the Pin B in the cable end to the battery cable connection on the starter switch. You'll get a little spark. This will polarize the generator. Re-connect the cable to the regulator. Retest the system.

If it still does not charge then turn all switches off. Remove the cable again at the regulator and connect a jumper to pin B again. Now start the engine and accelerated it to 2000 RPM. While watching the VOM touch the free end of the jumper to the same battery cable terminal on the starter switch and the meter should climb rapidly to 28 to 32 volts.
Do not let the voltage climb past 32 volts.
You must remove the jumper from the starter switch quickly before the voltage exceeds 32 Volts.

If your system went to 28 volts or higher the generator is good and the regulator is bad. If your system did not go above 25.5 volts your generator is malfunctioning. If you take the generator to a shop for repair take the regulator with you. If the generator was bad on your test then we cannot be sure the regulator is good so have it bench checked with the generator by your shop.
_________________
Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php