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Old 12-15-2014, 03:24 PM   #1
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Question Strange voltage readings

Driving about 300 miles the voltage meter on dash goes all way down to maybe 9, battery lite comes on.

I kept driving about 20 minutes it kicked back up to normal.

I notice when I first start the engine it reads low then in 5-10 minutes goes about half way, after an hour it goes about 2/3rds then after 3-4 hours it reads 3/4, it not the type of gauge that has real numbers on it except 8 & 18.

Since I watching it during the drive, I notice that when I let my foot off to coast the voltage goes way up, hit the petal it goes down a bit.

My first thought was the voltage regulator or alt, now I just don't know.

Batteries?

I have a 330 cat, where is the voltage regulator what does it look like on a diesel.

I need to drive 1100 miles after the holidays trying to route out this before hand
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Old 12-15-2014, 03:56 PM   #2
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Quote:
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My first thought was the voltage regulator or alt, now I just don't know.

Batteries?

I have a 330 cat, where is the voltage regulator what does it look like on a diesel.
I agree with you that it is the alternator, voltage regulator or batteries. I would pull the engine batteries and have them load tested. If they test okay, then next suspect would be alternator/regulator. I can't say for sure on the CAT 330, but on most engines the voltage regulator is built into the alternator. You could pull the alternator and have it load tested also. Some major auto parts places can spin test the alternator under load.
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Old 12-15-2014, 04:03 PM   #3
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You don't have a separate regulator - it is an integral part of the alternator.

Based on your description, it sounds like bad chassis batteries (basically shorting out the alternator) or a bad alternator (can't keep up with the load). Start by having the batteries load tested.
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Old 12-15-2014, 04:05 PM   #4
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Did you by chance hit a puddle of water just before it went down?

I used to have a car, when the alternator got wet it stopped alternating as it were (Stopped generating electricity) soon as it dried out all was good again,, That thing never gave me any tribble, lasted the life of the car, which died from a drug overdose.. yes, a drug overdose,, I stopped at the red light, so did the Sentry Drug shuttle truck, problem is I was already stopped at the red light so he dosed right over my car he did.
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Old 12-15-2014, 04:45 PM   #5
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your belt is slipping replace it
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Old 12-15-2014, 05:05 PM   #6
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your belt is slipping replace it
X2, Classic loose belt description.
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Old 12-15-2014, 05:40 PM   #7
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x2, classic loose belt description.
that was easy !!
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Old 12-15-2014, 05:45 PM   #8
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It does sound like a slipping belt. You can buy a can of belt dressing to spray on as a quick test if you are not comfortable checking the belt tension. In a pinch, start the generator and let the inverter/charger keep things up.
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Old 12-15-2014, 06:29 PM   #9
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Belt looks ok, don't know age???

I'll try the batteries, don't know the history on them since I bought the coach last year.

I did replace all the house batteries but not the chassis batts, I'll see if I can find a place to test them.

If I want to change the belt, I assume I use breaker bar against the idler pulley.
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Old 12-15-2014, 06:42 PM   #10
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Does seem like a slipping belt from how u describe it but I would take batterry cables off clean the connections and see if that makes a difference. Always best to try the free stuff first. In my case the alternator guage dropped all of a sudden and all the alarms came on, was losing power. Started genny, held boost button down with a beer cap to get home. Cleaning battery cables was the fix. Check to see if your belt is tight. It should be hard to turn the belt sideways with your hand. Most important if u are changing the belt... draw a diagram of the belt routing...it can be installed incorrectly making the belt to loose. Did anyone have your belt off for any reason ?
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Old 12-15-2014, 06:51 PM   #11
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With intermittent electrical problems, always start by checking connections, including grounds.
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Old 12-15-2014, 08:35 PM   #12
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With intermittent electrical problems, always start by checking connections, including grounds.

X2 clean all of your battery connections. And check and fill with water if needed.
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Old 12-15-2014, 08:43 PM   #13
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X2 clean all of your battery connections. And check and fill with water if needed.
Did complete cleanup in June, so all cables still looks great.

those chassis batts are sealed, hate them.
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Old 12-15-2014, 08:44 PM   #14
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With intermittent electrical problems, always start by checking connections, including grounds.

They might look good but I would clean them again. Maybe you will find a bad crimp
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