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Old 31 December 2014, 04:29   #11
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Hi yes lead acid car battery fitted next step is to try some load on the circuit and see what happens
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Old 31 December 2014, 06:44   #12
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Thanks
Out of interest if you are still running your mariner 30 do you know what voltage it was kicking out to the battery ?
The rectifiers I have are the part used on the older mariner 30's
I'm now running the Yamaha version of the same engine. At some point I'm going to put an oscilloscope on the various wires and seem what is happening - my tacho has stopped working and needs troubleshooting.
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Old 31 December 2014, 12:31   #13
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13.8 on a car is indicative of a faulty alternator.
This from another forum:
"Correct proceedure is ......
take vehicle for a short drive with everything turned off and on return without stopping engine and with everything turned off raise the engine speed to 2-3000 rpm and check the battery volts .. should climb to 14.4v as a minimum.
If not 14.4v the voltage regulator is faulty ...a voltage reg that only reaches 13.6v will give you about 6 months battery life."

ETA. I've checked this on our own cars & that's also what I get.
I've not tried the boat & must remember to try it & see what I get - but that won't be for a while.
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Old 31 December 2014, 13:25   #14
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I think now it is only a rectifier
It is only a rectifier. It is worth putting a rec/reg unit on-it's less likely to fry any electronics if you suffer a battery switch failure while running.

Give Electrex a call.
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Old 31 December 2014, 13:45   #15
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It is only a rectifier. It is worth putting a rec/reg unit on-it's less likely to fry any electronics if you suffer a battery switch failure while running.



Give Electrex a call.

Hi thanks I have sent them a email they will prob come back with there universal one being suitable,
Out of interest where did you find out the spec of the Stanley unit?
I spent hours trying to get info on it on the net with no joy
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Old 31 December 2014, 14:07   #16
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I recognise it
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Old 02 January 2015, 11:28   #17
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Since you're bugring about with your system, it might be worth noting that if you measure the output from a rectified but not regulated source it will be bumpy DC you are reading on your meter. Your meter will, therefore, not display a correct voltage unless you switch it to the AC range. Once you connect your system to a battery, you can consider it to be smooth DC (but it will still have a bump to it.).
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Old 03 January 2015, 01:29   #18
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Since you're bugring about with your system, it might be worth noting that if you measure the output from a rectified but not regulated source it will be bumpy DC you are reading on your meter. Your meter will, therefore, not display a correct voltage unless you switch it to the AC range.
Won't read correct then either. The output will be pulsed DC, but the AC meter will read half the peak value, smoothed to RMS of the waveform; somewhere around 40% or so. It is useful if you know what you're looking for (much like a car "test light" that comes on when connected to anything over about 9V.)

jky
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Old 03 January 2015, 08:13   #19
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Won't read correct then either. The output will be pulsed DC, but the AC meter will read half the peak value, smoothed to RMS of the waveform; somewhere around 40% or so. It is useful if you know what you're looking for (much like a car "test light" that comes on when connected to anything over about 9V.)

jky
Well that's how we measure AC! As an example, our UK mains is nominal 230v AC but the peak voltage is around 330v. Your figures are out too but I take the point you are trying to make.
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Old 04 January 2015, 14:14   #20
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To clarify: Most meters on AC will center the waveform for reference, then read RMS (rather than peak.) Which is why you can get an accurate AC reading of an AC component riding on a DC voltage.

Since you're talking about a rectified AC stream, the reference point (normally zero volts when reading AC) will be something less than half the peak voltage value (due to the area under the curve on either side), and the reading will be based on that.

The RMS factor is based on a pure sinewave waveform, so any deviation from a sinewave will read wrong. The resulting "AC" waveform in your case will be rounded pulses further apart than sinewaves on top, and closer to a squarewave on the bottom. Throws everything all wonky.

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