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Old 12-01-2011, 02:05 PM   #1
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Alternator not charing battery (dt466)

SOLVED
Problem solved.
A recap for others that have similar problems. Batteries weren't getting a proper charge but alternator seemed to be working so after numerous talks with mechanics and forum folks, it was most often guessed the regulator was the problem.
After taking the vehicle to two shops in town, one an alternator specialist, we found that to be the problem. Our dt466 diesel international had a relatively new (6mth) old alternator which has the regulator inside. The alt was a "private label" from International, which we were told by a Int dealer this particular one tends to have regulator failures.

Replacing the alt with a brand new one fixed the problem of it sometimes not charging the batteries or charging barely enough.


Good thing for us is the alt was under warranty so total cost to replace was $30 (loved that...no full hour rate charge), took 15 minutes.

Hope this helps others with similar problems!!



-------------original --------------
Hello everyone! I've ran into a weird problem with Fran. She's sat for about a week and temps here are 50's days, 40's nights and we're on the coast about a mile from the ocean.

Went to start her and the beeps that go off while warming up (glowplugs) before cranking the engine were not the usual noise but a higher pitch beep. The voltage gage (think that is the name) says she's at 12 (black area) when she usually sits just over 14 (green area). She did start without a hitch though, ran her for about 15 minutes before turning her off.
Too scared to drive her as we're living in her, so if she breaks down I have to get a tow and not sure the campground we're in would allow us to sit here with a vehicle not working. Sure can't afford a mechanic at the moment.

Any suggestions on what the problem might be? What to check for, clean, test. The alternator is brand new this summer. Battery cables are a bit old but seem in good enough condition. One battery is new, one old (yeah I know... shame on me). Suggestions, please
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Old 12-01-2011, 08:21 PM   #2
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Re: Weird beep during glowplug warm up (dt466)

Can you put a battery charger on it, and see if that changes the sound. A 3-stage battery charger is invaluable. I have a 8 amp Battery Minder and that thing has solved most my battery issues.
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Old 12-03-2011, 07:22 PM   #3
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Re: Weird beep during glowplug warm up (dt466)

I tested it with a multimeter today, the batteries appear to be fully charged, but they are not getting anything from the alternator. The alternator is about 6 months old now so I doubt it's dead yet lol so I'm thinking wiring, but I'm not sure where to start on checking those.

The beep didn't sound too far off this time though. We do have a charger, will probably have to plug it in to make sure they are topped off.
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Old 12-03-2011, 08:11 PM   #4
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Re: Weird beep during glowplug warm up (dt466)

Sounds like your beeper is going bad. Mine did that....still does at times.
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Old 12-03-2011, 10:44 PM   #5
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Re: Weird beep during glowplug warm up (dt466)

heh I thought the same thing but that doesn't explain the drop from a 14charge to a 12 on the meter.
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Old 12-03-2011, 11:00 PM   #6
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Re: Weird beep during glowplug warm up (dt466)

I was thinking the charger was good for given them a bump, but what's making them go dead in the first place?
Did you check the current draw on the batteries when the bus is off, take off one of the battery leads and stick an ammeter in there? Shouldn't be more than a couple hundred mA, for the radio and whatnot.
Far from a mechanic, just that's what occurs to me - start at the beginning and work out.

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Old 12-03-2011, 11:01 PM   #7
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Re: Weird beep during glowplug warm up (dt466)

Quote:
Originally Posted by Seeria
heh I thought the same thing but that doesn't explain the drop from a 14charge to a 12 on the meter.
Sure it does...its shorting out while its doing it.
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Old 12-04-2011, 12:13 AM   #8
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Re: Weird beep during glowplug warm up (dt466)

I had a 30 amp ground in the altenator cable on my bus. Usually I turn the battery switch off, but one day I was working on the bus and had the radio on. After about 30 minutes the radio went off. WTF? Found out I drained the battery. Did a resitance check between the positve lead and ground, 0.4 ohms! Then I disconnected the big wires from the power post, and checked the resistance to ground on each cable. Found the ground on the altenator cable. Wiggled the cable, and the ground went away. Guess I better fix it. Thanks for the reminder.
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Old 12-04-2011, 10:42 AM   #9
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Re: Weird beep during glowplug warm up (dt466)

When I park my bus I ALWAYS shut the master disconnect off. Most all buses have them.

I dont have any drains but I do it as habit, just incase something decides to happen.
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Old 12-15-2011, 04:28 PM   #10
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Re: Weird beep during glowplug warm up (dt466)

We took her out for a test run yesterday.

When we left the batteries showed a 12.7 voltage on a multimeter. As she drove the dash panel voltmeter showed 12 with occasional dips when she ran blinkers or brakelights. When we stopped the batteries were down to 12.45 on the multimeter, letting her idle while See was in the store the batteries went back up to 12.58. Back at the campground she's running a the same. Setting them up on a charger now.

The alternator is producing electromagnetic field, so it is doing something from whaat I understand. It is just not making it to the engine/batteries.

All I have for testing now is a digital multimeter (without an amp testing setting). Any ideas where to go from here?
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