Re: Charging Issue
[Re: cjskotni]
#2803811
08/01/20 04:58 PM
08/01/20 04:58 PM
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Joined: Aug 2007
Posts: 6,098 Valencia, España
NachoRT74
master
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master
Joined: Aug 2007
Posts: 6,098
Valencia, España
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if full fielding the alt didn't change, it is the alt. Mostly sure diodes banks
With a Charger born in Chrysler assembly plant in Valencia, Venezuela
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Re: Charging Issue
[Re: NachoRT74]
#2803923
08/01/20 08:03 PM
08/01/20 08:03 PM
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Joined: Jul 2007
Posts: 1,526 North Carolina
cjskotni
OP
pro stock
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OP
pro stock
Joined: Jul 2007
Posts: 1,526
North Carolina
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if full fielding the alt didn't change, it is the alt. Mostly sure diodes banks Thanks, Nacho. I just wanted a sanity check to make sure I wasn't missing anything.
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Re: Charging Issue
[Re: cjskotni]
#2804093
08/02/20 10:06 AM
08/02/20 10:06 AM
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Joined: Aug 2007
Posts: 6,098 Valencia, España
NachoRT74
master
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master
Joined: Aug 2007
Posts: 6,098
Valencia, España
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IF its the diodes banks ( positive or negative ), having the replacements they are easy to replace at home. No need for special tools, just 1/4" socket and some other.
they can be checked in fact without dissasemble the alt, just using the VOM leads from exterior on OHM function ( middle OHM scale should be enough sicne they use to be on 100-400 ohms rate ), since diodes banks are accesible.
They can be even visible damaged/burnt.
Here I show how the diodes can be tested for positive bank. Same aplies for negative diodes bank but againts the alt case not the stud and swaping around the VOM leads.
( I can't recall right now if the positive lead of the VOM must be on stud or diodes to check the positive bank, but if doesn't work just flip the VOM leads around ).
All 3 diodes should register same value
Last edited by NachoRT74; 08/02/20 10:14 AM.
With a Charger born in Chrysler assembly plant in Valencia, Venezuela
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Re: Charging Issue
[Re: NachoRT74]
#2804100
08/02/20 10:28 AM
08/02/20 10:28 AM
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Joined: Aug 2007
Posts: 6,098 Valencia, España
NachoRT74
master
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master
Joined: Aug 2007
Posts: 6,098
Valencia, España
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If diodes bank came out damaged, there are replacement kits. NOW, I'm not sure if any diode bank will hold the Tuff Stuff alternator output rate. https://store.alternatorparts.com/partno605.aspxor diodes banks separatelly if just need one of them https://store.alternatorparts.com/chrysler-square-back-rectifier.aspx( I bet there are cheaper sources for this ) they sell the same diodes bank for all their ( quickstart ) alt output rate kits the next thing it could be damaged is the stator being some of the windings broken/burnt. The Stator can be checked but alternator needs to be dissasembled. Stator can be also replaced BUT I think this could be provided just by Tuff Stuff. This is the bigger difference on the alternator ouput rate. Rotor can get damaged too simply testing for continuity between brushes and being isolated from chassis, But on this case you wouldn't register any kind of charge or voltage variation like you described making the tests.
Last edited by NachoRT74; 08/02/20 10:36 AM.
With a Charger born in Chrysler assembly plant in Valencia, Venezuela
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Re: Charging Issue
[Re: cjskotni]
#2804117
08/02/20 11:13 AM
08/02/20 11:13 AM
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Joined: Jan 2003
Posts: 15,527 Omaha Ne
TJP
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 15,527
Omaha Ne
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Nacho,
That is what I am afraid of (that OEM rebuild parts won't work for the high-output alternator).
I just replaced some fuel fittings so I had to run the car for a while to check for leaks. Guess, what? Alternator is now charging. Cold the alternator was at 14.5V down to 13.8V when the car was good and hot. Under a big load (AC on, max blower speed), the alternator was holding at 13.1V at around 900 RPM (out of gear idle).
The diodes can be heat sensitive: You tests do not look encouraging IE: Cold the alternator was at 14.5V down to 13.8V when the car was good and hot. and Under a big load (AC on, max blower speed), the alternator was holding at 13.1V at around 900 RPM (out of gear idle).
I would repeat the last test (load) with the RPM up to 2-2.5K and see what the readings are.
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Re: Charging Issue
[Re: cjskotni]
#2804146
08/02/20 11:53 AM
08/02/20 11:53 AM
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Joined: Aug 2007
Posts: 6,098 Valencia, España
NachoRT74
master
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master
Joined: Aug 2007
Posts: 6,098
Valencia, España
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Nacho,
That is what I am afraid of (that OEM rebuild parts won't work for the high-output alternator).
I wouldn't say that in the diodes bank case. Definitelly brushes and isolators are the same... Stator I don't think so of course. Rotor dunno. Now, about the SUDDENLY working alternator... check the field brushes assemblies. Fuel line runs at a side of the alternator and maybe playing around, the brushes were moved/relocated. We are talking about an 8 years alternator? but... how many miles or how much time you have run the engine ? Once I got a melted isolator and brush inserted in it, making to loose the contact with rotor trace ( I have a pic of that... somewhere ) Editing Found the pic. Somehow the brush could got heat enough being able to melt the isolator and get inserted into the plastic
Last edited by NachoRT74; 08/02/20 12:04 PM.
With a Charger born in Chrysler assembly plant in Valencia, Venezuela
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Re: Charging Issue
[Re: cjskotni]
#2804262
08/02/20 02:43 PM
08/02/20 02:43 PM
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Joined: Aug 2003
Posts: 43,307 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,307
Bend,OR USA
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Sounds like the alternator belt is slipping to me not making the alternator spin at the higher RPMs needed to make it work like it use to
Last edited by Cab_Burge; 08/02/20 02:44 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Charging Issue
[Re: cjskotni]
#2804459
08/02/20 07:34 PM
08/02/20 07:34 PM
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Joined: Aug 2007
Posts: 6,098 Valencia, España
NachoRT74
master
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master
Joined: Aug 2007
Posts: 6,098
Valencia, España
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why I never think on the belt ? LOL:
well, Is not common a belt gets loosen just like that!
With a Charger born in Chrysler assembly plant in Valencia, Venezuela
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Re: Charging Issue
[Re: cjskotni]
#2834174
10/18/20 11:08 AM
10/18/20 11:08 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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Since I full fielded this alternator before (and it didn't help). full fielding elims everything except the alt. I would check the brushes. got another alt you could sub in for a quick test?
live every 24 hour block of time like it's your last day on earth
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Re: Charging Issue
[Re: RapidRobert]
#2834195
10/18/20 12:19 PM
10/18/20 12:19 PM
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Joined: May 2019
Posts: 6,326 nowhere
Sniper
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Posts: 6,326
nowhere
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full fielding elims everything except the alt. I would check the brushes. got another alt you could sub in for a quick test? Maybe, depends on what he did. The alternator requires 12v on one field terminal (this is hot whenever the key is in run) and ground on the other (this comes from the VR). If he had an issue with the keyed 12v side and only grounded the other terminal then he hasn't eliminated everything but the alternator.
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Re: Charging Issue
[Re: cjskotni]
#2834598
10/19/20 12:44 PM
10/19/20 12:44 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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when I full field I get it on a fast idle/jump one field terminal to ground/feed 12V to the other field terminal. this eliminates the ign sw/ground & any else except the alt. this would be a good time to clean all terminals/connections including ground paths especially with the higher output alt on its way.
live every 24 hour block of time like it's your last day on earth
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