Re: Diode in alternator system

Posted by Joe (Wa) on March 05, 2005 at 20:56:15 from (67.5.135.39):

In Reply to: Re: Diode in alternator system posted by jdemaris on March 05, 2005 at 20:11:00:

You can go low tech on this thing for a quick check. Disconnect the neg (or pos) battery terminal, series a 12v light between the battery cable and the neg post. Use an indicator lamp or other bulb 1 amp or less. If the lamp lights full bright you know you are leaking current at the amp rating of the lamp or more. Takes many days at 1 amp or less draw to run down a 600-800 AH battery. If the lamp doesn't light the drain down problem is in the battery, low alt output, or your run time is not long enough to recover the battery from starting and normal run use.

If the lamp is lit, isolate unswitched terminals first as close to battery source as you can till the light goes out. If lamp is still on, lift the power-in terminal on switches. Lamp still on, you've got a leak to gnd between the battery and the terminals that you have lifted, may be a skinned wire rubbing on the frame, etc.

There can be 2 of more leaks to gnd with enough current to keep the lamp lit, so leave all terminals lifted until the lamp is completely out. As you connect the terminals back up keep an eye on the lamp.

Joe

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