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Old 03-07-2013, 01:16 PM
ShawnQ ShawnQ is offline
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Overcharging Issue - too many volts!

Hey guys,

Finally got my exhaust done, and got the Wag where it could be driven.

Now, at any point over idle, the voltage gauge starts to climb. At cruising speeds, it will go into the red and max out on the guage.

I have verified the gauge is fairly accurate with a volt-meter on the battery when this is happening.

I have taken a video of two things
1) The voltage gauge
2) underhood sound

You can hear the sound the alternator is making in both videos, but it is more pronounced in the under-hood video, obviously.

In regards to wiring, I checked the 2-prong connector that attaches to the alternator. The spades had a little di-electric on them, old, so I cleaned them as good as I could and re-installed it. No change.
I traced the red wire on the connector to the + side of the starter solenoid, through a green fusible link. It appears to have the same voltage at the solenoid as it has going to the alternator, so it isn't dropping anything anywhere, and looks to be in decent shape. The small brown or black wire from the 2-prong goes through the harness and back over to the driver's side, I believe into the dash.

Here's the interior video:
http://youtu.be/n7T95LKCA5Q

Here's the underhood video:
http://youtu.be/NextNeWOtx4

Last edited by ShawnQ : 03-07-2013 at 01:20 PM.
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  #2  
Old 03-07-2013, 01:22 PM
joe joe is offline
 
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My first guess would be the regulator is toast.
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Old 03-07-2013, 01:23 PM
ShawnQ ShawnQ is offline
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Joe,

Is there a simple way to diagnose that or is it something I would need to take to a parts house so they can load test it?
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Old 03-07-2013, 01:45 PM
joe joe is offline
 
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Quote:
Originally Posted by ShawnQ
Joe,

Is there a simple way to diagnose that or is it something I would need to take to a parts house so they can load test it?
To me you've already diagnosed it with a DMM. if you're reading as much voltage with the DMM/VOM as the gauge indicates that's pretty much the test showing that the regulator is shot. If the regulator is working correctly under no circumstances will it allow more the 14.6v from the alt. Helps to mention what year rig your working on? Later alts have internal regulators, early alts have external regulators. If yours is internal you need a new alt. Even if its external I'd replace the alt along with the regulator anyway. The alt and reg like to be matched sets. Usually if one goes south it'll damage the other so by just replacing one you can get into a vicious parts replacing loop. If it's the later internal regulator it's a no brainer just replace the alt, the reg will also be new.
Do it soon before you destroy the battery and the CVR in the temp gauge. If your gauges are or get all wonky/bouncy you prolly already destroyed the CVR for the gauges and you'll need a new temp gauge. In any case do the alt and reg repair first.
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Old 03-07-2013, 01:49 PM
ShawnQ ShawnQ is offline
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Joe,

Thanks for the info. I'll look for an alternator.

It is an '88 GW, so it has all of the electric goodies and will likely need the higher output version.

In regards to the gauges, everything works fine except for an intermittent issue with the fuel gauge. It reads sometimes, and some times it doesn't. I haven't popped the panel under the rear carpet yet, but I assume I'll find a bad connection somewhere. The only other electrical issues I have that I have yet to diagnose are a lack of dome lights/courtesy lights (under dash and instrument lights work), and neither one of my blower motors work. I know the door lights/dome lights are a common issue but I haven't had a chance to look into it yet. One thing at a time!

Now I need to try to figure out if I go with a stock unit or do an upgrade.

Thanks,
Shawn
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Old 03-07-2013, 04:12 PM
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serehill serehill is offline
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wait a minute

Have you looked closely to make sure all wiring is connected & has correct voltage. You should check voltage on the 2 wire plug going to the alternator. One would be on all the time 12+volts the other one should have voltage with the key on. Check those 2 places before you replace the Alternator. If you don't have voltage on the constant voltage pin it can cause this condition. If it doesn't have these voltage you need to fix that before you replace anything. Also make sure you clean the plug on both sides (alternator & plug is attached to the wire) & make sure it has good connections before you blow a bunch of money & find out it was something else. Those plugs are famous for corroding. You can also take the alternator off & take it to an alternator shop & have them replace the regulator cheaper than you can get another alternator. The alternator is working so it could easily be repaired.
I'm assuming this is a 3 wire.


That is a cs 144 upgraded unit on your rig. IMHO they rock
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Last edited by serehill : 03-07-2013 at 05:34 PM.
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Old 03-07-2013, 01:23 PM
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KJ Ryu KJ Ryu is offline
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Quote:
Originally Posted by joe
My first guess would be the regulator is toast.

X2
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Old 03-09-2013, 03:37 AM
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Cybrstar Cybrstar is offline
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Quote:
Originally Posted by joe
My first guess would be the regulator is toast.

Second that. If it reaches to high it will kill both battery and alternator. Buy a lifetime alternator from you local parts distributor (or even have them check your alternator and battery first). Then go from there.

Hopefully it not your wiring. My hood looks like it should belong in a Pasta Pomodora menu.
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Old 03-07-2013, 01:22 PM
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babywag babywag is offline
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Rebuild or replace your alternator, you're going to cook your battery.

Happened to me on a road trip, seems batteries don't like 17+ volts LOL.

People where flashing their brights @ me all night long, low beams work pretty good w/ high voltage.

When I finally made it to my destination the alt got replaced, and the battery too.
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  #10  
Old 03-07-2013, 01:26 PM
ShawnQ ShawnQ is offline
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Quote:
Originally Posted by babywag
Rebuild or replace your alternator, you're going to cook your battery.

That's why I'm not driving it...can't be good on the ol' battery!
Is it a general consensus to replace with a stock alternator or do most people upgrade? I am new, so excuse my ignorance...but I faintly remember reading about a CS-144? Is that an upgraded alt? Or am I confusing it with another ugprade?

Quote:
Originally Posted by babywag
Happened to me on a road trip, seems batteries don't like 17+ volts LOL.

People where flashing their brights @ me all night long, low beams work pretty good w/ high voltage.

When I finally made it to my destination the alt got replaced, and the battery too.

Hah! That's one way to get good lights out of these things!
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