RufusTheDufus
SILVER Star
- Thread starter
- #61
So it's Sense and Charge Lamp?
Isuzu NPR alternator vacuum ports
- Thread starter RufusTheDufus
- Start date
This site may earn a commission from merchant affiliate
links, including eBay, Amazon, Skimlinks, and others.
Ok, this is a freaking nightmare, thought it was working, now it’s not, wiring diagram seems to be wrong. Supposed to leave for a trip in 5 hours and just bled the steering pump and rebuilt for the second time this morning. Yghh!
Brakes work better than they have in ages however!
I pulled it, dropped it at an alternator shop in Calgary “Canadian Alternator” in the NE.
The fella is gonna fix it and tell me how it’s supposed to be wired up, within an hour and a half. Having Vietnamese food across the street with the girls while we wait
edit: alternator shop fixed it, I had it wired right but the regulator got shorted out or something. They fixed it for $95.
my rebuilt steering pump (cummins) is leaking again though.. probably the big o ring on the reservoir housing, I’ll have to fix it in the AM and hit the road. I left the house and filled up at the gas station only to see it leaking (at about 8pm to head out on a 3+ hour drive), turned around and went home. Bummer.
I pulled it, dropped it at an alternator shop in Calgary “Canadian Alternator” in the NE.
The fella is gonna fix it and tell me how it’s supposed to be wired up, within an hour and a half. Having Vietnamese food across the street with the girls while we wait
edit: alternator shop fixed it, I had it wired right but the regulator got shorted out or something. They fixed it for $95.
my rebuilt steering pump (cummins) is leaking again though.. probably the big o ring on the reservoir housing, I’ll have to fix it in the AM and hit the road. I left the house and filled up at the gas station only to see it leaking (at about 8pm to head out on a 3+ hour drive), turned around and went home. Bummer.
Last edited:
What happened to trans?
Don’t know yet, symptoms like a blown clutch but the clutch ain’t that old. I’ll have to pull it and see
Edit: It was the rear diff (again) no teeth left on the pinion, much of them were smeared into the ring gears.
Not a problem of mine anymore though, going to 14 bolt and SD D60
Edit: It was the rear diff (again) no teeth left on the pinion, much of them were smeared into the ring gears.
Not a problem of mine anymore though, going to 14 bolt and SD D60
Last edited:
kind of a thread revival, but I realized I had some pics of the ugly bracket I put together to make it fit
It was a lot of thinking to figure out how to get it on without modifying the alt, really close to other components including turbo drain line. But it works.
It was a lot of thinking to figure out how to get it on without modifying the alt, really close to other components including turbo drain line. But it works.
How's it running?
I found my alternator pump was opposite oil return on top and vacuum on bottom.I'm planning to switch from the stock Toyota alternator in my HJ45 to the Hitachi unit used in Izusu NPR trucks. The Toyota is a 35 amp or 40 amp externally regulated unit. The Hitachi is a 70 amp internally regulated type. I've got the wiring changes figured out. I'm trying to figure out the vacuum pump connections.
Here's my guess at the way they should be hooked up. Toyota on left and Hitachi on right. Is this correct?
Late thread update, I basically didn't drive it for a year and a half while swapping in one tons.
Its working great, one of my batteries died as it was sitting so long, but it charges batteries fine now and the brakes are sufficient.
Mind you now I have a chevy truck master cylinder, SD dana 60 from a 2005 Superduty,. 14 bolt from a 2005 GM so basically almost all my system is different, and I'm on larger tires (from 38" to 42's) but the vacuum pump is adequate so far. Can just get tires to start to lock up a bit on dry pavement if need to.
Brake booster is stock.
Just after the alt swap (for probably 200 kms) the vac pump made a big difference in comparison to the half missing cummins setup.
Last edited:
