Re: Finding the Voltage drop 68 Dodge Truck issue
[Re: wally426ci]
#2408817
11/25/17 10:01 PM
11/25/17 10:01 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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Lincoln Nebraska
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that charging rate is too high. I'm thinking this 2nd electromechanical reg is the problem, a considerably way less 2nd choice would be the alt. I would certainly want to get an electronic reg which most parts house types are now (have no wire wound resistors on the bottom side of it) & a Wells 706 (iirc) was the last electronic one I got but it dont look OE (if that is critical). For sure the starting issue ain't a lack of voltage but it is critical to get this dealt with first as that high of voltage will fry (or significantly shorten the life) of bulbs and any electrical component that is "on" while it is charging that high. As said jump from the batt positive post to the "ign" terminal on the reg but your (posted) voltage drops are about as perfect as I have ever seen & a voltage drop might not be the issue (easy/free to check). I'm assuming the reg is grounded well since it has been changed & confirm the block is grounded well to the firewall/batt neg post. Backing up a bit I'm assuming you have a 2 field terminal alt with one terminal grounded.
live every 24 hour block of time like it's your last day on earth
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Re: Finding the Voltage drop 68 Dodge Truck issue
[Re: wally426ci]
#2409318
11/26/17 10:16 PM
11/26/17 10:16 PM
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Posts: 36,041 Lincoln Nebraska
RapidRobert
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You know I was out jogging today & it crossed my mind that the unsteady ammeter needle would be from an electromechanical reg that ain't quite right or alt brushes/commutator (intermittent contact) but with your electronic reg that elims that. So I am thinking the alt if your idle speed is up high enough where it is supposed to be. On the high charging rate (which has to be dealt with) a sulphated battery would be the last potential but do continue to check voltage drops & jumping 12V to the reg "side" blue wire terminal would be my first step (a thin pin to stick in the triangle connector).
live every 24 hour block of time like it's your last day on earth
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Re: Finding the Voltage drop 68 Dodge Truck issue
[Re: wally426ci]
#2409550
11/27/17 12:38 PM
11/27/17 12:38 PM
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RapidRobert
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If that is actually a voltmeter then that wiggle/slight raise you reported is normal. but 15+ is still a critical problem.
live every 24 hour block of time like it's your last day on earth
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Re: Finding the Voltage drop 68 Dodge Truck issue
[Re: wally426ci]
#2414954
12/07/17 10:32 PM
12/07/17 10:32 PM
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Posts: 2,554 Maryland
wally426ci
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Ugh. Baffled by high alt stud voltage reading. Had a new alternator on the bench so i swapped that in. New battery because the old was not holding charge. All of my voltage readings are very similar to first numbers posted (15.6 at alt stud)
Tried a new regulator for kicks with no change. Figured it was worth a try...
Alt wire goes straight to starter relay (madd style) could it be something in that neighborhood? Fusible link connections?
Starting problem cured with new switch. Volt gauge still pulses 12-13 volts
Last edited by wally426ci; 12/07/17 10:33 PM.
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Re: Finding the Voltage drop 68 Dodge Truck issue
[Re: wally426ci]
#2414963
12/07/17 10:48 PM
12/07/17 10:48 PM
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Joined: Sep 2007
Posts: 14,889 up yours
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I've never used a volt gauge before this truck so I am not sure how they should be reading when tapping the full voltage at the gauges before the limiter..... Do you know how the IVR works? It's a clicker type regulator that uses the current passing thru it to heat up a bimetallic trip that cycles the load (gauges) on and off, you pick a poor source for your voltmeter as it is seeing that load clicking on and off. Did you ever get a reading at the voltage regulator sense voltage? I didn't see it in the thread. I suspect it is low.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: Finding the Voltage drop 68 Dodge Truck issue
[Re: wally426ci]
#2415162
12/08/17 12:14 PM
12/08/17 12:14 PM
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You really want to check as close as possible to the VR. The sense line splits at the ballast so you would not be checking the feed to the VR at all.
If you followed Chrysler color codes the blue wire is the sense line, should be the same as the battery or alternator output voltage. The green line controls the alternator and you need to check each end and compare as that reading will vary depending on load.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: Finding the Voltage drop 68 Dodge Truck issue
[Re: wally426ci]
#2415201
12/08/17 01:24 PM
12/08/17 01:24 PM
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Joined: Jan 2003
Posts: 21,122 Niles , Ohio
therocks
oh wait.but hey.lets see.oh yeah.
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oh wait.but hey.lets see.oh yeah.
Joined: Jan 2003
Posts: 21,122
Niles , Ohio
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Do you still have the factory amp gauge?If it has one try disconnecting it.I had lots of problems with the ones in my trucks.Unhooked all and used a vot meter.That and Wells isnt the best brand for electronics.i use Standards etc.Rocky
Chrysler Firepower
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Re: Finding the Voltage drop 68 Dodge Truck issue
[Re: wally426ci]
#2415859
12/09/17 07:45 PM
12/09/17 07:45 PM
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wally426ci
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Ok, with the vr triangular plug at the bottom of the vr, i got the following readings:
Idle: top wire = 14.4 bottom right = 4.6 rev: top wire = 15.5 bottom right =13
Truck was wired without issue for a few years.
I did question myself after seeing a diagram that showed the ignition feeding from the lower vr terminal. Mine is fed from the top like other diagrams. I used jumpers to swap the field connections onnthe vr for a few minutes. I must have cooked that new vr because after that the alt stud readings held steady around 12.26 and the gauge in the truck was no longer reading.
So far i have not run seperate witing like Robert suggested as i wanted to report back first. In addition, i added an extra ground and cleaned the alt connections at starter relay. New positive bat cable since i had one.
Last edited by wally426ci; 12/11/17 03:13 PM.
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Re: Finding the Voltage drop 68 Dodge Truck issue
[Re: wally426ci]
#2415895
12/09/17 09:04 PM
12/09/17 09:04 PM
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Posts: 14,889 up yours
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Looks like the voltage sense is reading properly.
What does the ground for both the regulator and alternator look like? I'd run extra for testing.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: Over Charging Problem 68 Dodge Truck
[Re: wally426ci]
#2417064
12/11/17 11:44 PM
12/11/17 11:44 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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when the shop tested the alt did they give you a sheet with the voltage? which is what it produces when full fielded. You might try this: pull both female terminals off of the alt male field terminals & jump one terminal to the nearby alt case (ground) then hook the voltmeter to the alt (batt stud/nearby alt case) & idle it at a good fast idle & jump 12V to the other alt male field terminal for several seconds, just long enough to see what the voltmeter reads & have all lights/accessories OFF for this. Is this the same 15+V reading you are dealing with? You might also grab a coil of wire & some alligator clips from the HELP section at your parts house & make some jumpers & pull both field leads from the alt & pull the triangle reg connector & jump 12V to the top reg nub and 12V to either male alt field terminal then connect the other reg (side) nub only to the other alt male field terminal & jumper from the reg case to ground & start it & at a fast idle see what the voltmeter AT the alt reads. this takes the wiring out of the picture & only leaves the reg or the alt. & electronic regs almost always either go open (no charging) or full field (max voltage the alt can produce).
live every 24 hour block of time like it's your last day on earth
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