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post #11 of 14 Old 08-06-2010
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Originally Posted by JimMcGee View Post

When I get to the boat this weekend I'm going to check my breaker panel and determine if Catalina installed a hot bus (always hot regardless of battery switch position). If not I'll add one as this will be a cleaner installation than tying multiple lines to a battery terminal.
Jim, as far as I know they didn't. The DP is served from the output of the 1-2-B switch, the Common post. That's why all DC stuff turns off when you turn the 1-2-B switch to OFF.

If you want further information, go find your boat manual which should have a wiring diagram. If you don't have one, go to the C30 Association website, International Catalina 30 Association and you should be able to find one.

Stu Jackson, Catalina 34, 1986, M25 engine, Rocna 10 (22#), Maple Bay, BC, Canada
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post #12 of 14 Old 08-18-2010
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I'm trying to wire a new Sony marine stereo in my '78 Oday 25. We tried installing a stereo a month ago and didn't get any power to the unit at all. I brought the stereo back and got a different one. Hooked that one up last night and got power to the unit but it was very flaky. We did discover that our power wire (red) was corroded. Is it possible that our 32 year old wiring fried the units
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post #13 of 14 Old 08-18-2010
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"We did discover that our power wire (red) was corroded. Is it possible that our 32 year old wiring fried the units"
Not likely that you fried the stereos. Old wiring tends to fail, as in provide no voltage at all. to fry them, you'd have to provide excess voltage (regulator failure on the alternator or 17V from solar panels) or reverse voltage.
If you want to be sure, run some alligator wires (buy a long set from Radio Shack) from the battery directly to the radio power leads. Stereos often use two positive leads, typically red and orange for the main power and the memory power and you may need to power up BOTH for it to work. And then another wire, black or yellow, for the negative aka "ground" lead.
Then there are the speakers...if it uses four that's eight more wires and if you only test one, and the fade/balance knob is set to the other side you get the sounds of silence.
On a boat that old it probably pays to run new power wires (hot and ground) all the way from the panel to the radio, assuming you've got good power into the panel. No telling what a PO did, like creatively splice in lamp cord with a twist and tape in some hidden place.
Alligator wires: A good long-term investment of ten bucks.
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post #14 of 14 Old 08-18-2010
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Not likely unless you reversed the positive and negative wires. If your wiring is that old and corroded best to use new tinned wire to hook up the stereo.
An inexpensive multimeter would be useful as well. Digital ones are available for about $15 now. When checking wires with the digital for voltage if the leads are reversed you will get a negative number. Very easy to use for troubleshooting and checking before attaching the wires.

Was the red wire positive? On an old boat you can't be sure without checking.

Living aboard in Victoria Harbour

Last edited by mitiempo; 08-18-2010 at 12:41 PM. Reason: add
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