Re: overcharging
[Re: maxwedge1]
#2563649
10/14/18 12:11 AM
10/14/18 12:11 AM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
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About to go away
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Battery voltage should match alternator output stud voltage. If it doesn't then the wiring between the alternator output and the battery and anything inline with it such as an ammeter is suspect. Is your fusible link good?
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: overcharging
[Re: maxwedge1]
#2563684
10/14/18 01:00 AM
10/14/18 01:00 AM
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Joined: Feb 2003
Posts: 8,707
Andrewh
master
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master
Joined: Feb 2003
Posts: 8,707
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what supercuda says is true, you should be looking at wiring issues between the battery and the vr.
it passes through the bulkhead from the battery to the amp meter, to the ignition and then back out the bulkhead again.
Also be sure you are using the same reference for ground, as that can change your readings too. in case that doesn't make sense, if you are checking the vr, don't use the battery as ground. use the bolt holding it on the firewall as ground, unless you added a ground strap.
or voltage at the alt, field wire, use the alt case as the ground for that voltage.
In theory this should not change the reading. in practice bad grounds will cause different voltages, especially at the vr.
But that is nearly a 1 volt drop, which will screw with your charging system.
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Re: overcharging
[Re: maxwedge1]
#2563691
10/14/18 01:10 AM
10/14/18 01:10 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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run an 8 ga jumper line from batt positive terminal to the alt "batt" threaded stud & see what you get at the battery at a fast idle. EDIT (much) easier yet, hook your large "regular" jumper cables from the batt pos/neg posts over to the alt "batt" stud/housing case (have a helper hold the ends at the alt) & fire it up & see what you get at the batt & the alt. 15+ is way too high for a charged battery. You might even get a handfull of HF mini jumpers with alligator clips & feed the reg/alt field circuits including ground paths & see what develops. this takes everything out of the picture exc the hard components: alt/reg/batt.
Last edited by RapidRobert; 10/14/18 01:36 AM. Reason: bored
live every 24 hour block of time like it's your last day on earth
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Re: overcharging
[Re: maxwedge1]
#2563800
10/14/18 12:01 PM
10/14/18 12:01 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
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About to go away
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The voltage on the blue line should be the same as at the battery + and the alternator output stud. That;s what the VR uses to determine the required alternator output. If it is reading low then it will try to run the alternator harder to bring the voltage up. Probably dirty/loose connections in that line. I usually remove, clean, tighten and reinstall them.
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: overcharging
[Re: maxwedge1]
#2563812
10/14/18 12:20 PM
10/14/18 12:20 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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Circle Track
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Posts: 36,041
Lincoln Nebraska
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Yes the blue wire (ign1) out from the bulkhead feeds the alt (blue wire) field terminal/reg top triangle blue wire connector/upstream side of ballast/ECU power in terminal likely red if OE/blue yellow on MP ECU connector pigtail/even elec choke if used. Grab your meter!
live every 24 hour block of time like it's your last day on earth
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Re: overcharging
[Re: maxwedge1]
#2563830
10/14/18 01:22 PM
10/14/18 01:22 PM
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Joined: Feb 2003
Posts: 8,707
Andrewh
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When I finally gave up on chasing the drop, I used that line to feed a relay instead to power directly from the battery to the vr. but yeah, grab a meter and start checking to see when you get a change working your way back. http://www.mymopar.com/index.php?pid=28at least the diagrms.
Last edited by Andrewh; 10/14/18 01:23 PM.
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Re: overcharging
[Re: maxwedge1]
#2564069
10/14/18 09:30 PM
10/14/18 09:30 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
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I would use a relay controlled by a switched feed and use the relay to send the blue line voltage from the battery.
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: overcharging
[Re: maxwedge1]
#2564072
10/14/18 09:39 PM
10/14/18 09:39 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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Circle Track
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Lincoln Nebraska
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battery 12.4 down a bit from testing and 12.3 at the field terms and output running 13.6-14. at a fast idle the batt is 12.4/12.3 & the alt large batt terminal is 13.6-14, correct? post everything what you have jumped/fed/bypassed.
live every 24 hour block of time like it's your last day on earth
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Re: overcharging
[Re: maxwedge1]
#2564591
10/15/18 09:09 PM
10/15/18 09:09 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
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About to go away
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Posts: 14,889
up yours
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By "at rest" do you mean engine not running? Because your descriptions are confusing. The idle numbers look good, did that fix what you were seeing?
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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