need electrical help 73 charger
#1421139
04/17/13 07:46 AM
04/17/13 07:46 AM
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Joined: Feb 2004
Posts: 855 ontario canada kingston
aspenrt360
OP
super stock
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OP
super stock
Joined: Feb 2004
Posts: 855
ontario canada kingston
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Hey guy's out of my depth here with a charging problem. just can't get a charging system problem sorted.new alt. tested and good a couple of known and new volotage regs. tested and good wires tested and good. problem is an overcharge. 13.5 at idle but when revved it goes to 16 almost 17v. revere field wires and it goes back to normal. but wires get really hot. any ideas? car is almost ready for paint and i want this fixed before that . everything on the car works perfect except for the overcharge. thanks
2013 Chrysler 300 touring 1974 Dodge Charger SE. 360-727-8.75-3.23 sure grip 1972 Dodge Dart Swinger 1995 Dodge Ram 1500 4x4
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Re: need electrical help 73 charger
[Re: aspenrt360]
#1421140
04/17/13 08:07 AM
04/17/13 08:07 AM
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Joined: Jul 2007
Posts: 1,526 North Carolina
cjskotni
pro stock
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pro stock
Joined: Jul 2007
Posts: 1,526
North Carolina
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Sounds like you may need to check the grounds on the regulator and alternator. Make sure the regulator housing is making good, clean contact to the firewall METAL. You may need the scrape the paint off the mounting holes to get this. Star washers help here. Do you have the firewall to engine ground strap intalled? With the engine running, measure the voltage between the regulator housing and the alternator case. Since both should be grounded, there should be a negligable voltage drop bewteen the two. If there is voltage between the two, I would check re-check grounds! Hwck if you have the tools, use a 16 ga or lower jumper wire with alligator clips to connect the VR housing to the neg battery terminal. If this helps the problem, grounding is the problem...try the same with the alternator case.. Grounds will get you every time with these cars!
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Re: need electrical help 73 charger
[Re: aspenrt360]
#1421141
04/17/13 08:14 AM
04/17/13 08:14 AM
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Joined: Nov 2003
Posts: 441 Maud,Tx
maud
mopar
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mopar
Joined: Nov 2003
Posts: 441
Maud,Tx
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It doesn't matter which field wire goes on which terminal, the field current just goes though the field windings then back to the reg. The reg sends full field current to the alt, through the field windings, then back to the reg. At this point there is no flow of current, so no alt output. The alt output depends on the amount of field current flow. To get flow the current must go to ground. It goes to ground though the reg case. If the reg isn't grounded good the alt won't work. Try pulling one field wire off alt, the alt should not work, if it does one of the brushes is grounded. Try unbolting the reg with all the wires hooked up. The alt should not work, and the reg case should test hot. If the alt does work I would suspect a field wire grounding issue. If everything checks out good, you have a bad reg. The reg is supposed to limit the amount of current it sends to ground to keep the alt output at 14.5 volts. If it is over that, the reg is bad. Hope some of this makes sense.
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Re: need electrical help 73 charger
[Re: Andrewh]
#1421145
04/17/13 11:36 AM
04/17/13 11:36 AM
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Joined: Feb 2004
Posts: 855 ontario canada kingston
aspenrt360
OP
super stock
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OP
super stock
Joined: Feb 2004
Posts: 855
ontario canada kingston
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so if i am getting this right the feeling is it is a field wire? or the alt ? i have a spare alt and i did a contiuity test on the field wires and they were good but one could be grounding right? and thanks guy's for the responses keep em coming.
2013 Chrysler 300 touring 1974 Dodge Charger SE. 360-727-8.75-3.23 sure grip 1972 Dodge Dart Swinger 1995 Dodge Ram 1500 4x4
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Re: need electrical help 73 charger
[Re: aspenrt360]
#1421149
04/17/13 02:43 PM
04/17/13 02:43 PM
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Joined: Sep 2003
Posts: 1,168 Vancouver, WA
MoparMarq
super stock
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super stock
Joined: Sep 2003
Posts: 1,168
Vancouver, WA
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Quote:
so if i am getting this right the feeling is it is a field wire? or the alt ?
Could be one or other or both.
Quote:
i have a spare alt and i did a contiuity test on the field wires and they were good but one could be grounding right?
Yes. When you check continuity on field wire terminals, you want low or no resistance, IIRC (I could be wrong there). BUT, you also want to make sure that there is NO continuity between either one of the field terminals and the case of the alternator (indicating a brush short to the case), that WOULD cause the alternator to charge like mad. And if one brush were shorted to the case, that MIGHT cause the symptoms you described.
I'm no electrical guru, but if I were doing it, I'd try to either get the alternator tested - which might not prove anything other than it can put out it's rated power, which we already know, OR swap in a known good alternator, which would eliminate one source of trouble.
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Re: need electrical help 73 charger
[Re: sandberg]
#1421154
04/19/13 08:30 PM
04/19/13 08:30 PM
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Joined: Sep 2003
Posts: 1,168 Vancouver, WA
MoparMarq
super stock
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super stock
Joined: Sep 2003
Posts: 1,168
Vancouver, WA
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Quote:
i'd take a day or two to be away from it, calm your nerves a bit. if you have a friend have him take a look at it with a fresh perspective. you might go nuts looking at the same thing over and over.
Agreed. Sometimes a good night's sleep helps provide a fresh perspective.
Seems like wiring may be a possible conspirator here. I might check for a possible intermittent short to ground of the wires from VR along harness to alternator. That harness insulation can get pretty hot and crunchy sitting on top of the intake manifold along the passenger side rocker arm cover.
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Re: need electrical help 73 charger
[Re: MoparMarq]
#1421155
04/19/13 09:40 PM
04/19/13 09:40 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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I'd toss in another known good batt for a quick check of a batt internal issue. Reversing the field wiring makes me think something is awry there with the wiring schematics. I'd take off ALL wiring & with jumper wires with alligator clips termporarily rewire EVERYTHING. Batt positive post to reg "top" terminal and to either alt field terminal. other alt field to other reg "side" terminal. reg case and alt case to batt neg post. engine to batt neg. frame to batt neg. Try your larger regular jumper cables between alt case & batt neg post and alt "batt" terminal to battery positive post.
Last edited by RapidRobert; 04/19/13 10:01 PM.
live every 24 hour block of time like it's your last day on earth
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Re: need electrical help 73 charger
[Re: aspenrt360]
#1421157
04/20/13 11:49 AM
04/20/13 11:49 AM
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Joined: Aug 2007
Posts: 6,109 Valencia, España
NachoRT74
master
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master
Joined: Aug 2007
Posts: 6,109
Valencia, España
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adding my two cents based on an experience I got, since pretty much everything has being talked
ONCE I got between 18 and 24 volts depending RPMs, however NEVER got charge. Made a continuity test and everything was perfect.
make it spin it by hand and quite often could feel somekind of step!!! BARELLY able to feel it
Decided to dissasembly the alt to check what it was happening and FOUND one of the stator leads going to diodes bank somekind worn or with signs of friction.
APPARENTLY some of the fan vanes was slightly touching this stator lead. I pushed out the stator lead, reassembly and everything came out nice.
How this happened suddenly ? dunno... was the rotor able to slide into the rear housing ? is posible the front bearing could move back from front housing... This bearing fits into front housing easy without any kind of real pressure just fit tight but if pulleys have somekind of slight missalignment could happen!
With a Charger born in Chrysler assembly plant in Valencia, Venezuela
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