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Power dropout...stereo and electronics...

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Power dropout...stereo and electronics...

Old 08-13-2011, 07:47 AM
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Default Power dropout...stereo and electronics...

OK..this is getting a bit frustrating...
I have a 2002 Pursuit 3070 that seems to have a battery voltage issue.
When I run the Furuno electronics and stereo together, the electronics occaisionally drop out, then recycle back on...as does the stereo volume. There is no old battery issue...just installed a new GRP 31 105 ah house battery two days ago....boat has two 850 ah starting batteries as well, wired through the propietary Pursuit TABS box at the stern. I have read that the Yamaha F225 charging system is not very good at charging up the house battery with this system...I've changed three batteries in 2 1/2 years, getting pretty old.
OR....is the Clarion stereo head unit getting old...maybe shorting out the system...it's the original, from '02? None of this happens when the boat is in the slip/lift running on shore power.....or when I have the portable 2kw genset running. And yes, the onboard charger is working when on 120v shore power...tested it for output...confirmed the reading on the panel meter.
Any suggestions?
Old 08-13-2011, 12:37 PM
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Old fashioned diagnostics.

What is the battery voltage during the problem? What is the voltage at the devices during the problem?

If these voltages are different by more that a volt, see where the drop is by measuring point-to-point through that circuit.

With it working when the charger is active, it may be a Yamaha alternator issue. What is the output voltage from that alternator?
Old 08-13-2011, 12:44 PM
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I believe (don't quote me, going by (dim) memory from info on THT) that the F225's put out 48 amps at high rpm....dropping a lot to around 28 or so at idle/cruise.....
Old 08-13-2011, 03:47 PM
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Originally Posted by phreaticus53 View Post
OK..this is getting a bit frustrating...
I have a 2002 Pursuit 3070 that seems to have a battery voltage issue.
When I run the Furuno electronics and stereo together, the electronics occaisionally drop out, then recycle back on...as does the stereo volume. There is no old battery issue...just installed a new GRP 31 105 ah house battery two days ago....boat has two 850 ah starting batteries as well, wired through the propietary Pursuit TABS box at the stern. I have read that the Yamaha F225 charging system is not very good at charging up the house battery with this system...I've changed three batteries in 2 1/2 years, getting pretty old.
OR....is the Clarion stereo head unit getting old...maybe shorting out the system...it's the original, from '02? None of this happens when the boat is in the slip/lift running on shore power.....or when I have the portable 2kw genset running. And yes, the onboard charger is working when on 120v shore power...tested it for output...confirmed the reading on the panel meter.
Any suggestions?
Stereos do not draw more power as they age so if the stereo is working correctly and not blowing fuses, it's not "shorting out the system".

You should not need to run the motors to run your electronics so it's not the charging system.

Assuming proper voltage at the batteries, you either have a relatively large voltage drop in the wiring from the batteries to the point where the electronics are connected or you have a loose connection that is causing them to lose power intermittantly.

You or your marine electrician will have to measure the power available to the electronics (while they are on and consuming power) and compare it to the battery voltage and then find out where the probllem is and correct it. Look for loose or corroded connections on both the positive and negative wiring. Wiring that's too small capacity can also cause this problem but if this is a new problem, you can rule this out because the wire size has not changed.

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