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500K2 Electrical Connection Blocks

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mike the bike:
You've got 5 wires.  3 yellows, a red and a black (or green)
The yellows come from the alternator and the red, black go to the battery via the voltage regulator.

To check each diode in turn, using a multimeter on the ohms range, or the diode range.   Or you can use a battery and bulb set up.

The diodes only conduct in one direction,  which is what you're looking for.
 
Put a meter lead on the negative and check each yellow in turn.

Put the other meter lead on the negative and check each yellow

You've now  checked D1, D3 & D5.
You should have a reading one way but not the other way

Put a meter lead on the positive (red) and check each yellow.
 Put the other meter lead on the positive and check each yellow again.

You've now checked D2, D4 & D6.

If it checks out, good.  Put it back on the bike.

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