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Old 1st December 2011, 02:13 PM   #21
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It should be charging. What is the DC voltage on all 3 legs of any one of the FETs?

Make a quick check to confirm that they all have approximately the same voltage.
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Old 5th December 2011, 02:22 PM   #22
manina is offline manina  Germany
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1 - 0,04
2 - 13,6
3 - 12,5

All are showing the same voltage however 12,5V at the output is not enough to properly charge an AGM battery.

The other MBR I have has 13,3V at the output - much better
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Old 5th December 2011, 02:28 PM   #23
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They are no being driven on.

Post the voltage on all 3 legs of Q8.
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Old 5th December 2011, 02:49 PM   #24
manina is offline manina  Germany
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1 - 0
2 - 19,9
3 - 30
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Old 5th December 2011, 03:16 PM   #25
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That transistor is defective.

The use of hyphens as dividers can be confusing, please use a colon or something that cannot be confused as a negative sign in the future.
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Old 5th December 2011, 03:26 PM   #26
manina is offline manina  Germany
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ok, I'll change it and see what will be the output.


Thanks so far
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Old 5th December 2011, 04:50 PM   #27
manina is offline manina  Germany
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Changed Q8 and now the output is at 13,3V

Issue solved!!!

Perry you are great
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Old 5th December 2011, 05:26 PM   #28
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You may want to check one more thing. With no battery on the output, does the output of both MBRs drop to near 0v?
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Old 5th December 2011, 05:36 PM   #29
manina is offline manina  Germany
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No, they do not drop

Actually, they show both the input voltage (13,6V)
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Old 5th December 2011, 07:31 PM   #30
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I don't think that's right.

Is there a resistor that's connected to pin 2, 3 or 15 of IC2 that's not shown on the diagram?

If not, compare the DC voltage on those pins of each MBR.
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