Electrical Bonding
Friday - June 12, 2009•Views: 4870••
After observing rapid consumption of the shaft zinc, I checked the continuity of the bonding system in the boat according to instructions from Norm Pierce as follows:
"A break in the bonding system should show up by using an ohm meter with a long wire added to it. Once you have added the long wire to one of the test leads read and record the resistance of the added wire. Then attach one lead to the shaft with a hose clamp to make sure you have a good connection. Then touch the lead to a cleaned area on each of the thru hulls, the cutlass bearing and skeg to make sure you have a good connection on the interior of the boat. High resistance would indicate a bad or broken bonding connection inside."
The rudder log was the end of the line for continuity. The bolt on the aftermost corner of the bronze log was corroded, and the other bolt was the first “terminal” that did not have a connection. Backing off the ¾” nuts a couple of turns a couple of times polished them enough to regain continuity. The resistance between the shaft log and the shaft came down to about 150 ohms from infinite. These connections are on my winter list to thoroughly renew.
"A break in the bonding system should show up by using an ohm meter with a long wire added to it. Once you have added the long wire to one of the test leads read and record the resistance of the added wire. Then attach one lead to the shaft with a hose clamp to make sure you have a good connection. Then touch the lead to a cleaned area on each of the thru hulls, the cutlass bearing and skeg to make sure you have a good connection on the interior of the boat. High resistance would indicate a bad or broken bonding connection inside."
The rudder log was the end of the line for continuity. The bolt on the aftermost corner of the bronze log was corroded, and the other bolt was the first “terminal” that did not have a connection. Backing off the ¾” nuts a couple of turns a couple of times polished them enough to regain continuity. The resistance between the shaft log and the shaft came down to about 150 ohms from infinite. These connections are on my winter list to thoroughly renew.
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