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Second Battery not charging


Mike Hill
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Not neccessarily... the charging amps are far lower than the cranking amps, you can get charging amps through a partial connection. :001_smile:

 

Bad connections may allow a small current but not a stonking big one, especailly if its an intermittant fault.

 

I think he has replaced the batteries for new as well which dis-counts the batts

 

But thats not what he said was the problem.

 

Problem was stated as the bat was going flat/not getting charged. Not that it was charged but not providing power. If the current (and volts) has been measured to the battery & is ok then its the bat.

 

But like most problems we have not been given enough info to really get to the bottom of this.

 

If it was in front of me I would

 

chec each bats voltage at rest (12.8v is full)

chec each bats voltage under charge (up to 14.4-14.8v once nearly charged)

chec each bats voltage under load

chec the voltage at the alternator when running

chec the amps to each bat & total amps from alt

resistance test each terminal (pref under load so a Volt across the terminal test)

Then I would check the SG of the bats if poss

I would also swap the bats over if I had not found the problem yet.

 

Does it have a split charge relay/diode or are they just linked together?

If it does then test that too.

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