Tips for using a clamp amp - Small Boat General Discusion - Small Boat Forum Message Boards

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Joined:	Tue Feb 23rd, 2010
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Hello all,

Here are some tips for using clamp amp. Hope you'll like it..!!

# DC current comes from the boats battery system and AC tells the technician to start looking at the shore power

# Keep switching and testing between AC and DC. AC might also come from bad diodes in the alternator, dirty current from battery chargers, leaking AC appliances, or power cord leaks. AC found in the DC system causes premature battery failure, errant noise in the radios, and electrical board failure

# Note whether the meter is reading positive or negative. This tells us what direction the current is flowing-Use a clamp amp on the output lead of an alternator to check amperage. If one third of the output is shown as AC, and two-thirds DC then the alternator has a bad diode.

# Clamp the output lead of the alternator with the engine off. Any amperage shows a shorted diode-Turn on every mast accessory (eg; mast head light, anchor light, spreader lights, etc…) at the same time. Clamp every piece of rigging individually. About 20% of the time I find a mast accessory leaking amperage to ground through the mast, down the rigging, and finally into the bonding system causing corrosion damage along the way

# Add up all the amperages in the positive leads at the base of the mast then compare that to (the normally) single mast ground lead. If they are not equal then search out the errant power.

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