Re: Over Charging Problem 68 Dodge Truck
[Re: RapidRobert]
#2868130
01/02/21 03:30 PM
01/02/21 03:30 PM
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Joined: Jul 2007
Posts: 2,554 Maryland
wally426ci
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OP
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Maryland
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Happy New Year everyone. My charging issue has crept up again. Here is what I’ve done:
Truck was basically idle for a year or so with engine/trans build. Recently installed with good body grounds. Connections at firewall clean & snug. Fuse block cleaned. Truck runs well and would not notice this issue until 5 mins of driving or so.
Issue with previous charts as guide. I am trying to determine if this points to a particular component. Battery load tested well at a reputable battery shop. Squareback alternator with new style voltage regulator (triangular plug).
Readings (location, Idle voltage, 2500 rpm, engine off)
Battery positive terminal (12.16, 14.7, 12.53) Alternator stud (12.23, 19+, 12.53) Coil (10.36, 15+, 0) Top/center electronic VR terminal (11.27, 16+, 0)
+ sign means it was still climbing
Gauge, key switch and fuse block connections all clean & tight....
Greatly appreciate a bit of input.
Last edited by wally426ci; 01/02/21 05:52 PM.
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Re: Over Charging Problem 68 Dodge Truck
[Re: Andrewh]
#2868155
01/02/21 05:44 PM
01/02/21 05:44 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
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Lincoln Nebraska
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You might make up some jumper wires with alligator clips & jump each/all connections including grounds ALL BACK TO THE BATTERY & if normal then all the hard components are good & it is a positive or negative wiring/connector/ground issue. you might remove one at a time till the issue flares which pinpoints the problem. you might have to modify this procedure to suit but you get the jist of it. we gotta do some elimination. stay in touch (we got your back).
live every 24 hour block of time like it's your last day on earth
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Re: Over Charging Problem 68 Dodge Truck
[Re: wally426ci]
#2868278
01/02/21 10:08 PM
01/02/21 10:08 PM
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Joined: Jul 2007
Posts: 2,554 Maryland
wally426ci
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Robert, when I jump, should I get a multimeter reading at the gauge each time? And I presume jumping coil/regulator?
Last edited by wally426ci; 01/02/21 10:21 PM.
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Re: Over Charging Problem 68 Dodge Truck
[Re: wally426ci]
#2868297
01/02/21 10:50 PM
01/02/21 10:50 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
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Circle Track
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we're dealing with a charging issue so we will work on the charging components. jump from batt positive terminal to the top (blue wire) terminal on the reg (stick a thick pin/wire in to get continuity). jump from batt neg post to the reg case. pull the 2 wires off of the alt field terminals (dont let em touch ground). jump from one male alt field terminal to the battery positive terminal. jump the other alt field male terminal to the green wire in the reg connector (use a thick pin/wire). jump from the battery positive terminal to the large alt threaded stud. jump from the batt negative post to the alt case (you might use your jumper cables for this if they are secured good or have a helper hold them). fire it up to a fast idle & see what voltage you get at the battery. only have it running for a few seconds 10 or so (long enough to get a reading) as full fielding from a bad component/grounded wire will fry things in short order. have all lights/radio etc off. I dont think I missed anything. this elims everything except the alt/reg/battery. EDIT we could jump one at a time but that is too much full fielding. you might pull the alt brushes & a visual there, they are a frequent culprit. my gut says alt or reg
Last edited by RapidRobert; 01/02/21 10:54 PM.
live every 24 hour block of time like it's your last day on earth
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Re: Over Charging Problem 68 Dodge Truck
[Re: wally426ci]
#2869058
01/04/21 08:04 PM
01/04/21 08:04 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
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Agreed I have never known an electronic reg to go back & forth. I'm thinking a connector or ground is losing/regaining continuity OR the brush assy in the alt is doing the same thing. Keep after it & keep us posted
live every 24 hour block of time like it's your last day on earth
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Re: Over Charging Problem 68 Dodge Truck
[Re: RapidRobert]
#2869344
01/05/21 02:52 PM
01/05/21 02:52 PM
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Joined: Sep 2003
Posts: 19,408 north of coder
moparx
"Butt Crack Bob"
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"Butt Crack Bob"
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north of coder
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have you had the brushes out and closely examined the isolated brush holder ? what does the armature look like ? also, are the male connections to the brushes clean and tight ?
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Re: Over Charging Problem 68 Dodge Truck
[Re: moparx]
#2869580
01/06/21 05:40 AM
01/06/21 05:40 AM
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Joined: Aug 2007
Posts: 6,095 Valencia, España
NachoRT74
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Have you tried remove the alt and spin by hand to check some friction, contact or weird feeling when spinning? May have not necessary remove the alt but just loose the belts and feel it.
I had once my alt giving up to 18volts at iddle ( more giving RPMs ) but no charge on ammeter ( some charge when giving RPMs ). One of the stator lead to diodes was making contact with just one of cooling vanes on rotor when spinning. Hard to feel but I was able to feel a small "stop" similar to the elect distributor stop due the magnet with reluctor points when spinning. Dissasembled, bent the wire a bit and done.
With a Charger born in Chrysler assembly plant in Valencia, Venezuela
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Re: Over Charging Problem 68 Dodge Truck
[Re: moparx]
#2869657
01/06/21 12:17 PM
01/06/21 12:17 PM
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Joined: Jul 2007
Posts: 2,554 Maryland
wally426ci
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OP
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Posts: 2,554
Maryland
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have you had the brushes out and closely examined the isolated brush holder ? what does the armature look like ? also, are the male connections to the brushes clean and tight ? Good points all! I'm wallpapering this week, but will get back to it this Weekend.
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Re: Over Charging Problem 68 Dodge Truck
[Re: wally426ci]
#2878010
01/21/21 06:56 PM
01/21/21 06:56 PM
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Joined: Jul 2007
Posts: 2,554 Maryland
wally426ci
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I appreciate everyone's help here. At the moment, I have a tentative fix (until I drive it more).
I double checked connections and grounds and did not find an issue. I kept thinking it was mechanical, because it would run fine for 5 minutes and almost switch to the high voltage. That told me it wasn't a connection.
I cleaned my Alt brushes and at the same time I replaced the VR. I am back to my original 14.7 idle to 14.5 readings at the gauge & across terminals/alternator, so I am hopeful that it was mainly the VR since the brushed looked fine to the eye. Keep ya'll posted (again)!
I have yet to jump anything, but I have that well documented in case this happens again.......
Last edited by wally426ci; 01/21/21 06:57 PM.
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Re: Over Charging Problem 68 Dodge Truck
[Re: wally426ci]
#2879129
01/23/21 07:25 PM
01/23/21 07:25 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
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Posts: 36,040
Lincoln Nebraska
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what you might do if interested is unplug the reg & plug it into the old reg & ground the reg body with a jumper & see if it was the reg or the brushes
live every 24 hour block of time like it's your last day on earth
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