Thread: New Isuzu Owner

The PO apparently ran the battery flat serveral times which I think might have killed it, I'm got to get a multi meter and charger tomorrow and we'll see what happens.


dswatts: Regarding the boat, Indeed it has it was launched 1897 according to the earliest record we could find and it's been in the family since 1953 when my grandad pulled it out of the maylands boat graveyard and rebuilt it. Prior to that its was a ferry/tug in albany and Esperance in the 20s and was shark fishing off Lancelin in the 30s.

about 20 years ago we had a fellow in his mid 90s come down and have a look at it his uncle had bought it and he remembered seeing it arrive in Albany on the train in the 20s


It's currently at RFBYC and gets near constant use over at Rotto throughout summer.

Well Battery charged but no luck

Even with the new voltage reg it doesn't look like the alternator is putting
out over 12v and it drops as soon as the lights are turned on, I was
expecting 13-14v I think thats right.


Does anyone know the part number for a replacement alterntator that
would bolt in. I believe that the bracket was changed at some point is
there any way to tell which I should be using.

cheers

Check the part number thread.. there are a couple of different versions (120A, 80A 70A 40A.)

I got the 70A, as higher output would have meant upgrading the wiring.

It is one like this: NEW ALTERNATOR 86 87 88 89 90 ISUZU NPR 3.9 4BD1 ENGINE | eBay

Which is a chinese copy of the Hitachi.. but the genuine one is $650+ and I think mine was about $200 to my door.

What do you mean change braket? When I changed mine, i had to cut the bracket as the old one was too long to fit between the feet. This is because the later model trucks have their feet closer together (and an overall smaller unit).

If you are ordering online, MAKE SURE YOU GET A 12V ONE!!! there are a lot of 24V truck ones, as it is a truck engine.

Yeah I was going through the CDs I've got through the site
they list

4bd1
100210-1150
12V 40A

and

4BD1T
LR170-401
12V 70A

I was looking at the one you linked already and given how bad the wiring is I'll prob need to redo most of it anyway.

Just saw that car in the marketplace this morning, crap I was just about to get excited and catch a flight over there

So apparently the other alternator option is ALT7055R-80

Voltage: 12V
Amperage: 80amp
Reg Type: Internally Regulated
Mount Type: Twin Foot
Pulley Type: 1A
Pulley OD: 82mm
Shaft Dia: 17mm

Centre to Centre: 170mm
Inside Leg: 80mm
Leg Measurement: 0mm
Adj Leg Hole Dia: M8mm
Front Mt Hole Dia: 10mm
Rear Mt Hole Dia: 10.5mm
Notes : 50cc Pump

Does anyone know what would be the most likely to fit

I'm guessing the original 40A is hard to find but requires the least work to fit

the other 2 require me to rewire the system to work without the external voltage reg and cut down the bracket to 80mm from the 97 original

Does this all sound correct ?

Originally Posted by Distortion

the other 2 require me to rewire the system to work without the external voltage reg and cut down the bracket to 80mm from the 97 original

Does this all sound correct ?

Yep. I havnt rewired the external regulator yet, and it over charges.

So bit of an update

Got round to fitting a replacement alternator (cheers Bearman) and I've
run into further problems with this one overvolting,

seems to put out arount 13.5 at idle but goes all the way up to over 16 possibly much higher at driving rpm.

swapped the voltage regs around again just to check the old one still causes a charge light to stay on but the voltage still seems to be 16V
or more

so short story
Old alternator with old Reg was around 12.2V@2000rpm with the charge light staying on

Old alternator with new Reg was around 12.2V@2000rpm with the charge light going off

New alternator with old Reg was around 17V@2000rpm with the charge light staying on


New alternator with new Reg was around 17V@2000rpm with the charge light going off

anyway I'm thoughly confused anyone have any ideas before I go hand money over to an auto electrician

cheers