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Old 19 January 2022, 07:51   #1
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In-line voltage regulator

So my outboard is putting our 15-16ish volts at high RPM I suspect regulator is bad.

I dont really want to spend a fortune on a new one (also incredibly hard to find for a late 80s outboard)

Im not 100% sure what I am doing but why cant I put a 24-12v in-line regulator on the positive from the battery to axillarys? Or any other work arounds?
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Old 19 January 2022, 09:47   #2
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If it’s regularly putting out 15-16v it will be boiling your battery.
You could stick a diode in line with the alternator to drop the voltage slightly, but that’s an awful solution (what if the regulator totally fails?)

Your solution of a 12v regulator before your electronics would work, Victron do various DC/DC converters.

But really you just need to sort the regulator. Everything else is just a bodge.
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Old 19 January 2022, 15:31   #3
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Kaman on here did a thread low cost reg under a tenna from memory
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Old 19 January 2022, 19:13   #4
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What engine?
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Old 19 January 2022, 19:16   #5
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Are you sure it’s supposed to have a regulator?
A lot of 80’s stuff just had a bridge rectifier IIRC.
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Old 19 January 2022, 19:58   #6
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Our friend BP did a very informative post on a similar subject ,very interesting maybe regarding regulator purchase from overseas .
https://www.rib.net/forum/f36/how-lo...ast-84139.html
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Old 20 January 2022, 09:42   #7
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I am not sure if it has a regulator to be honest. I cannot find any workshop manuals and am working off a parts catalogue (which I am not even sure is the correct one but so far all the parts look the same)

No one will look at it as such an old engine.

Yamaha 80hp serial number L 350 123 80 aet 6ho

I believe the part number is 6G5-81960-A0-00

I am afraid to admit it because of the potential backlash. But Ive had a lot of good luck with Chinese knock offs so may consider it.
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Old 20 January 2022, 10:11   #8
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For 30 quid, I'd probably just take a punt : https://ssimarine.co.uk/products/rec...p-6g5-81960-a0
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Old 20 January 2022, 10:36   #9
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Quote:
Originally Posted by Matt View Post
For 30 quid, I'd probably just take a punt : https://ssimarine.co.uk/products/rec...p-6g5-81960-a0

Seem this one but it seems to look completely different to the one I have on. Not sure how to even connect it. One I have has got 4 bolts in the centre

Will need to get a good look and see if I can make it fit
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Old 20 January 2022, 11:58   #10
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On old motors, unless you are aiming for an "as new" restoration, it's always worth just being pragmatic.

What I couldn't quite tell though is that if this just a rectifier (I see both the word regulator & rectifier used on the part number) , then 15-16 volts is common and you don't have a problem.

The amp output from the stators on old carbed motors is pretty low at the best of times and it just fizzes the battery a little.

And even the ones "back in the day" with a regulator was a simple setup - just a zener diode and a heatsink I think.

Unlike modern stuff that has proper alternators & regulators owing to their much greater electrical needs.
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Old 26 February 2022, 17:17   #11
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So just an update got my hands on the repair manual (got lots of other things im fixing/ breaking more with this engine)

Anyway testing the regulator got all kinds of strange readings. Going to buy a used one (only OEM I can get is from the states). If that works great, if not will try to fit one of those generic ones I see. Will report back with results
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