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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Joined: Jul 2007
Posts: 2,554 Maryland
wally426ci
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Maryland
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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
Supercuda
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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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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
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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: 21,050 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: 21,050
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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Joined: Jul 2007
Posts: 2,554 Maryland
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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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
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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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