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Old 23-05-2020, 05:11   #1
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Wiring alternator for yanmar 2ym15 similar to 2gm series

I bought the boat with a faulty alternator lost the diagram I made

The replacement alternator is a 80 amp from Hitachi
sold buy Protorque comparable with my engine they claimed???

(I presume this high amp alternator will take half the HP away if 80 amp starter battery or the domestic 80 amp battery are flat or even at normal 50% used for domestic and might cause belt sequel under heavy loads )

No poxy wiring instruction in box or online best I can tell

I went to car rewire alternator shop to get the old alternator fixed as back up assume it is a Hitachi 50 amp but might be 35 amp

Repair agent said from looking the old alternators not so rusty pins that this type is a self insulating type and looking the new one he said the Bat marked terminal was positive and looking the back of alternator second terminal going clockwise was the negative .
I asked him about the terminal with earth on it should I connect the earth up and he said definitely no

There is another thin terminal wire on the side of alternator which best I can figure is to signal on the the key dash board some information

The key dash board has no real information the basic issue rpm key left glow key right start and stop button

The engine starts and runs presently without the alternator hooked in

Tuesday I launch onto water and need to know before I to that that the alternator information I have is correct

Pics below to follow in few mins
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Old 23-05-2020, 05:55   #2
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Re: Wiring alternator for yanmar 2ym15 similar to 2gm series

Picture of back of alternative!for 80 amp

Red positive connected to teminal bat about 11 o'clock on pic

Black negative connected to terminal two clockwise from red skipping terminal at 12 o clock and on terminal at one o clock

No earth connected to terminal with simple screw system under bat positive at about 9 o clock


Nothing connected to little blue wire possibly sensor about 6 o'clock coming from side of alternator

Interested this set up don't burn up the alternator
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Old 23-05-2020, 06:36   #3
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Re: Wiring alternator for yanmar 2ym15 similar to 2gm series

PS
I forgot there is a plug in box with two spade fitting that is straight forward plug in located at 8 o clock in the pic of back of 80 amp alternator that is plugged in I assume its some sort of sensor or exciter or something to do with start up and so forth
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Old 24-05-2020, 13:01   #4
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Re: Wiring alternator for yanmar 2ym15 similar to 2gm series

Lots of searching internet came up with this picture wiring diagram and seems to say what info I need


https://images.app.goo.gl/9cVvDYeWjWvD7ZB18

https://images.app.goo.gl/ueCpKYfERMaQbcu6A

Picture says ground to any of the two negative posts and the second pic days days strap the the two negative terminals and the alternator is self insulated

Risk it got biscuit start the engine tommorow and monitor battery voltage

A link here helps

https://forums.ybw.com/index.php?thr...r-swop.443882/



Next link attached from crise.forum say Hatachi alternators suck for killing batteries and need external systems to recharge batteries properly


https://www.cruisersforum.com/forums...ed-131133.html
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