I bought a alternator kit for my generator. It didn't come with any instructions. There are no markings on the alternator, not even a part number for me look up other than the Lister Petter number, the maker of the generator. So I need to know how to hook this little sucker up. It is internally regulated. It has a pigtail connector on it, that has 3 14ga wires in it, a blue, red, and green. It also has a stud. The green I assume is a ground, the stud I assume goes to the battery, either the red or blue is a 12v source for the regulator. Im lost on the other wire and which one is the 12v. I don't want to burn this little thing up.

 

Ok I used my multimeter and the green wire in the pigtail is not a ground wire.

 

A bit confused..

Is this an Alternator for a Generator as in a standby genset since I see you are refering to a Lister Petter?
Is it the battery charging alternator for the engine?

If it is for a genset I am also on this site and some are experts on the Lister.

http://www.smokstak.com/forum/forumdisplay.php?f=6

Jim

 

Thanks Geico but this is a internally regulated alternator, not a external one like you linked to.

Jim it is a 12v alternator for the engine on a standby generator.

 

Any idea who makes it? if it is for a Lister, then it might be a Lucas or maybe a Prestolite.
They also used some Delco's.
Any pictures of it.
Jim

 

There are no markings at all on this, just the Lister Petter sticker with the part number. Give me a bit and I will get some pics.

 

Pictures......

 

from what I can tell from the pictures,I think it's a dennso. Probably the two wire plug is the activator plug.If I remember right one needs to be hot all of the time,and one should go off and on with the switchIt's been awhile since I did a rebuild on one of them.Another way is You can take a jumper wire and flash power into the two wire plug,and the alt. should kick in and charge. The single wire might be for a idiot light,I've never saw a plug setup like this before.

 

I remember seeing this before,
This looks like the same Nippon-Denso alternator, check and see if the harness will disconnect from the housing and see if the pinout looks the same.
The rear mount looks to be a bit different but there are many variants of this unit.
How many Kw is this genset.
Jim


http://www.f1-rocketboy.com/alternator.htm

 

Alright thank you Jim!!! That is it. I dont't need the light so just hook the B post to the battery, and the S post to a 12v source, or do both the S and IG post need to be 12v?


It is a 15kw genset sold by Lister Petter. It has their LPW4 engine hooked to a Hawkpower generator head. Got it for $500.

 

You STOLE IT!


Anymore $500 Gensets like that???


K.

 

The "B" terminal will go straight to the battery with a heavy gauge cable like a 6ga.

The "Ign" would go the a circuit that has +12 volts when the engine is running (fuel solenoid, Hobbs meter, master switch)

The "S" wire would go the actual +12 volt buss in the control panel or to the (+) battery terminal.

It's purpose is to sense the actual system voltage and then adjust the output to compensate for the voltage drop and losses from whatever is being drawn from the battery so it can charge the battery AND provide additional power for any external loads.

If you connect them together at the alternator it will fool the regulator into thinking the voltage at the battery is the same as after losses and then regulation will be poor. The battery would not receive a full charge.

Do you have any pictures of your Genset?

This is one of mine I have just sold about 6 months ago.

It was a MEP-003 rated at 10 Kw.
Onan DJC 4 cyl. Air cooled diesel 1800 RPM
Single & 3-phase 100% duty cycle.

A bit overkill like everything I do.
Jim

 

Yea it was a great deal. Asked the guy where I bought the alternator from and he said the last new engine of that style they sold by its self was a little over 3k.

Only thing I had to do to get it to run is put a fuel solenoid on it and take the delivery valves out, clean and lube them up and work them a bit. They had gummed up and were stuck from sitting for awhile. She runs like a champ. Need to get my transfer switch installed so I can actually use her.



Jim: Thank you so much for the help. I will get some pics of it here in a little bit.

 

Pictures......

 

Alright, I put this thing on today, and wired according to that link. The IG and S terminals went to oil pressure switch on the genset, it gets 12v when the engine is running. Here is the problem the S terminal, supposedly the sensing terminal, is putting power out, this in turn is power the oil pressure not switch not allowing me to shut down the engine. The L terminal is also putting out power. So what is the deal here?