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Head flushing lowers Capac reading
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jhemp3
#1 Posted : Wednesday, February 24, 2010 9:53:26 AM(UTC)
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I happend to be taking a Capac reading last weekend when my wife flushed the head; reading went to 2. I know that's not good but need suggestions about how to diagnose what might be the problem. Thanks in advance.
Jim
Jim Hemphill
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fastjeff
#2 Posted : Wednesday, February 24, 2010 11:12:30 AM(UTC)
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What kind of food was she eating! Woooah!

Actually, what type of head do you have?

Jeff
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SORRYDOG2
#3 Posted : Wednesday, February 24, 2010 1:39:45 PM(UTC)
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Jeff , you thinking LOW VOLTAGE? Sorrydog
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fastjeff
#4 Posted : Wednesday, February 24, 2010 11:01:47 PM(UTC)
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Right, and leaking into the hull as the macerator (or ?) is run.

Jeff
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dougrose
#5 Posted : Wednesday, February 24, 2010 11:42:21 PM(UTC)
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The head on my boat was wired with the negative side of the head motor connected to the hull. This is a bad idea.

Most Marinettes seem to be wired with battery negatives going to a stud in the hull just forward of the engines, with the engine starter returns wired to the same point. That stud acts as a ground plate.

If you have the factory wiring, then when you run the head the current goes into the hull and finds its way to the ground stud. It then runs up the battery wires to the negative side of the battery. There is resistance in the connection between the hull and the battery wire, and if you have your Capac hull lead connected to the ground stud, then your Capac reads the voltage drop across this small resistance. You will notice it with the high current drawn by the head.

You might consider trying first: to ensure that the hull lead for your Capac has its own connection to the hull, not shared with the electrical system, and, second: running a return wire from the head motor back to your ground plate, or directly to the negative terminal of the battery you are using.



1975 32' Flybridge Sedan, twin Perkins 6-354 diesels, 1:1.53 velvetdrives, 16 X 19 props. Merritt Island, Florida
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Barkleydave
#6 Posted : Thursday, February 25, 2010 12:33:24 AM(UTC)
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Just a reminder. If a reading of 2.1 on your CAPAC meter is actually.. -2.1 volts.

Personally I would not be too concerned about the reading since flushing is not done constantly. What I would check is that your ground connection for your macerator is clean and making solid contact. If it is not then resistance increases and has a potential of melting the wires and possibly starting a fire. Doug is absolutely correct as usual. Many of our electrical glitches will track back to poor grounds.

dave
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jhemp3
#7 Posted : Thursday, February 25, 2010 4:05:28 AM(UTC)
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Thanks for the ideas, guys. After ruling out dietary concerns, I'll start with the grounding quality.
Jim
Jim Hemphill
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'87 32' FBS, USCG Certification #1057921
Berthed MM 207 Tennessee River, Picwick State Park Marina
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fastjeff
#8 Posted : Thursday, February 25, 2010 11:10:05 AM(UTC)
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Not to be picky, but a CAPAC reading of '2' equals 0.2 volts. Anyone replacing the stock meter head, or making their own probe and meter arrangement, needs to know that.

Jeff
"...reality is not nearly as lovely as the world of Liberal Land. No wonder so many people want to go there." - Tom Sowell
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Barkleydave
#9 Posted : Monday, March 01, 2010 2:00:21 AM(UTC)
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Jeff:

Right on -.2

dave

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GB49
#10 Posted : Friday, March 05, 2010 2:14:28 PM(UTC)
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Turn the blowers on while pushing the capac and watch it drop. This is true at least if you have lower helm such as 32 sedan.
I attributed it to inductance. The capac wires run along the rest of the boat harness. Going to try some shielded wire if I get all the other projects done.

-Karl
1986, 32' Sedan, twin 360ci, 275hp Chrysler's w/ K&N flame arrestors
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dougrose
#11 Posted : Sunday, March 07, 2010 7:00:24 AM(UTC)
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Usually inductive coupling is not a factor in direct current circuits - could be, just unusual. If I were to bet a beer, it would be on the voltage drop at the ground stud.

Moving the Capac meter hull connection to its own stud, not right next to the engine grounds, might well do it.


1975 32' Flybridge Sedan, twin Perkins 6-354 diesels, 1:1.53 velvetdrives, 16 X 19 props. Merritt Island, Florida
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GB49
#12 Posted : Monday, March 08, 2010 1:23:53 AM(UTC)
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dougrose wrote:
Usually inductive coupling is not a factor in direct current circuits - could be, just unusual. If I were to bet a beer, it would be on the voltage drop at the ground stud.

Moving the Capac meter hull connection to its own stud, not right next to the engine grounds, might well do it.


Excellent point on DC inductance.
In that case I'd have to agree on the voltage drop as well.

-Karl
1986, 32' Sedan, twin 360ci, 275hp Chrysler's w/ K&N flame arrestors
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