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alternator over charge #1418303 04/11/13 05:08 PM 04/11/13 05:08 PM
Joined: Jan 2003 Posts: 32,918 Grand Prairie,Texas stumpy OP I Win
stumpy OP I Win Joined: Jan 2003 Posts: 32,918 Grand Prairie,Texas	This is driving me crazy. My charging system is running at 15+ volts. It's a two field alt and I have gone through 4 VRs and still no difference. I have a ground wire for the VR as well as a new plug. The green wire to the VR from the alt has continuity as well as power with the key on.I have battery voltage at the main alt post plus batt voltage to the other (red)field terminal. I am using a volt meter and it pulsates as do the lights. What am I doing wrong that makes the alt put out such a high voltage? Last edited by stumpy; 04/11/13 05:24 PM.

Re: alternator over charge [Re: stumpy] #1418304 04/11/13 05:23 PM 04/11/13 05:23 PM
Joined: Jun 2008 Posts: 1,506 Indiana G GrnMagic77 Peter Parker
GrnMagic77 Peter Parker G Joined: Jun 2008 Posts: 1,506 Indiana	Maybe temporarily swap out the battery with a known good one just to see if it makes a difference then go from there. 1978 Round Up-1977 Warlock-1977 Powerwagon Adven.- 1976 Blue "Macho"-1974 Charger-1968 Fury III -1966 Newport *

Re: alternator over charge 1983 D150 [Re: GrnMagic77] #1418305 04/11/13 05:25 PM 04/11/13 05:25 PM
Joined: Jan 2003 Posts: 32,918 Grand Prairie,Texas stumpy OP I Win
stumpy OP I Win Joined: Jan 2003 Posts: 32,918 Grand Prairie,Texas	Should I have power from the green wire with the key on and the engine not running? Last edited by stumpy; 04/11/13 05:49 PM.

Re: alternator over charge 1983 D150 [Re: stumpy] #1418306 04/11/13 06:03 PM 04/11/13 06:03 PM
Joined: Aug 2007 Posts: 6,095 Valencia, España NachoRT74 master
NachoRT74 master Joined: Aug 2007 Posts: 6,095 Valencia, España	yes... on mech reg, positive pole... on elect regs negative pole With a Charger born in Chrysler assembly plant in Valencia, Venezuela

Re: alternator over charge 1983 D150 [Re: stumpy] #1418307 04/11/13 06:05 PM 04/11/13 06:05 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Quote: Should I have power from the green wire with the key on and the engine not running? You'd have switched 12V to the blue wire terminal at the alt field then it'd go in/thru/out the internal field to the outside green wire field terminal so yes. take off both field wire female connectors & see if there's continuity between the 1 green wire male terminal on the brush assy to ground (should not be) & check the brush & it's holder for continuity to ground somewhere (should be no continuity). Something is grounding & making the field circuit full field on the green wire grounding side just like it would if you deliberately full fielded the green wire. Holler how it goes Stump! live every 24 hour block of time like it's your last day on earth

Re: alternator over charge 1983 D150 [Re: RapidRobert] #1418308 04/11/13 06:23 PM 04/11/13 06:23 PM
Joined: Aug 2007 Posts: 6,095 Valencia, España NachoRT74 master
NachoRT74 master Joined: Aug 2007 Posts: 6,095 Valencia, España	Quote: Quote: Should I have power from the green wire with the key on and the engine not running? You'd have switched 12V to the blue wire terminal at the alt field then it'd go in/thru/out the internal field to the outside green wire field terminal so yes. take off both field wire female connectors & see if there's continuity between the 1 green wire male terminal on the brush assy to ground (should not be) & check the brush & it's holder for continuity to ground somewhere (should be no continuity). Something is grounding & making the field circuit full field on the green wire grounding side just like it would if you deliberately full fielded the green wire. Holler how it goes Stump! I should say, the green wire gets negative pole AT BRUSH END disconected, but checking from regulator plug disconected, green wire will test for positive pole, due the power coming in from to the blue wire alt brush and coming out from the other bush once goes by the rotor With a Charger born in Chrysler assembly plant in Valencia, Venezuela

Re: alternator over charge 1983 D150 [Re: NachoRT74] #1418309 04/11/13 06:53 PM 04/11/13 06:53 PM
Joined: Jan 2003 Posts: 2,360 PA 7 70HemiGTX top fuel
70HemiGTX top fuel 7 Joined: Jan 2003 Posts: 2,360 PA	Look for a bad connection somewhere in one of your heavy load lines. Like the one that goes up the steering column, at the bulkhead, etc. I had a burned connection on my column. Drove me and a few garages nuts for about 2 years. One day I noticed a black streak in the heavy wire in the plastic coupler. I bypassed the coupler and that cured the overcharging.

Re: alternator over charge 1983 D150 [Re: NachoRT74] #1418310 04/11/13 06:58 PM 04/11/13 06:58 PM
Joined: Jan 2003 Posts: 32,918 Grand Prairie,Texas stumpy OP I Win
stumpy OP I Win Joined: Jan 2003 Posts: 32,918 Grand Prairie,Texas	No continuity from either brush to ground. I have battery voltage to a red wire at the brush, maybe the blue wire you mentioned, and at the main terminal. At the regulator I have battery voltage at the green wire from the alt and nothing on the blue wire with the key on engine not running. With the key off I only have battery voltage to the main alt wire.

Re: alternator over charge 1983 D150 [Re: stumpy] #1418311 04/11/13 07:20 PM 04/11/13 07:20 PM
Joined: Feb 2003 Posts: 8,670 A Andrewh master
Andrewh master A Joined: Feb 2003 Posts: 8,670	not just voltage and continuity. how much voltage. if it is low you will over charge. there are several places you could be loosing voltage in the sensing line as well. power goes in, through the switch then back out again, and the connector. any of these things could drop the voltage as well causing the vr to over charge.

Re: alternator over charge 1983 D150 [Re: stumpy] #1418312 04/11/13 08:42 PM 04/11/13 08:42 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Quote: At the regulator I have battery voltage at the green wire from the alt and nothing on the blue wire with the key on engine not running. Stump does this have a std 70's setup with green/blue field wires? Blue to an alt field. Blue to reg top terminal. green from reg side terminal to the other alt field. Where is the "red" wire in all this? You said "nothing on the blue wire" etc; you'd need switched 12V at the blue wire at the reg top terminal in the triangle with the key on (eng on or off) & the blue field wire at the alt would be hot with key on also (switched 12V) live every 24 hour block of time like it's your last day on earth

Re: alternator over charge 1983 D150 [Re: RapidRobert] #1418313 04/11/13 09:29 PM 04/11/13 09:29 PM
Joined: Jan 2003 Posts: 32,918 Grand Prairie,Texas stumpy OP I Win
stumpy OP I Win Joined: Jan 2003 Posts: 32,918 Grand Prairie,Texas	Thetwo feld wires are green and red. The VR wires are red and green with green to the side and red at the top.I get no power to the top VR terminal. Looks like I am having some ignition switch issues but I will replace it tomorrow. 7664451-altwire001.JPG (40 downloads) Last edited by stumpy; 04/11/13 09:37 PM.

Re: alternator over charge 1983 D150 [Re: stumpy] #1418314 04/11/13 09:47 PM 04/11/13 09:47 PM
Joined: Jan 2003 Posts: 32,918 Grand Prairie,Texas stumpy OP I Win
stumpy OP I Win Joined: Jan 2003 Posts: 32,918 Grand Prairie,Texas	I found a wiring diagram and it looks like the red at the alt and the red at the Vr are the same circuit coming from the ignition switch. The guy I got the truck from did some rewiring and It looks like I get to redo it.

Re: alternator over charge 1983 D150 [Re: stumpy] #1418315 04/11/13 09:56 PM 04/11/13 09:56 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	You might jump 12V to the "red" male alt terminal & 12V to the "top" male nub terminal on the reg & see if it straightens out live every 24 hour block of time like it's your last day on earth

Re: alternator over charge 1983 D150 [Re: RapidRobert] #1418316 04/11/13 10:02 PM 04/11/13 10:02 PM
Joined: Jan 2003 Posts: 32,918 Grand Prairie,Texas stumpy OP I Win
stumpy OP I Win Joined: Jan 2003 Posts: 32,918 Grand Prairie,Texas	Right after I finish with the ignition swap. Hopefully I will be able to figure out what was done to the wiring then.

Re: alternator over charge 1983 D150 [Re: stumpy] #1418317 04/12/13 12:50 AM 04/12/13 12:50 AM
Joined: Oct 2007 Posts: 3,877 Oregon hooziewhatsit master
hooziewhatsit master Joined: Oct 2007 Posts: 3,877 Oregon	Another quick test ( ) Put your voltmeter leads on the battery+, and on the red wire* at the alternator. This voltage should be close to 0v. My bet is that it's ~.75v, or exactly the amount your voltage is above what it should be. (battery should be 14.4v. If you're seeing 15.2v, you would see 0.6v with this test. This is the culmination of all the voltage drops from the battery to the red wire at the alt) *For stock non-hacked systems, this is the blue wire. If you ever find yourself in a fair fight, your tactics suck.

Re: alternator over charge 1983 D150 [Re: hooziewhatsit] #1418318 04/12/13 12:59 AM 04/12/13 12:59 AM
Joined: Jan 2004 Posts: 27,347 Today? Who Knows? 1_WILD_RT Management Trainee
1_WILD_RT Management Trainee Joined: Jan 2004 Posts: 27,347 Today? Who Knows?	Stumpy, have you checked for full voltage to red wire at the regulator? That is what the regulator uses as a reference... If it is low the regulator will force the alternator to over charge.. As you know a marginal ground to the regulator will do the same thing... Good Luck.. "The Armies of our ancestors were lucky, in that they were not trailed by a second army of pencil pushers."

Re: alternator over charge 1983 D150 [Re: hooziewhatsit] #1418319 04/12/13 01:11 AM 04/12/13 01:11 AM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Quote: (battery should be 14.4v. If you're seeing 15.2v, you would see 0.6v with this test. If the batt is showing 14.4V & alt is showing 15.2V should the VOM read 0.8V live every 24 hour block of time like it's your last day on earth

Re: alternator over charge 1983 D150 [Re: RapidRobert] #1418320 04/12/13 01:54 AM 04/12/13 01:54 AM
Joined: Oct 2007 Posts: 3,877 Oregon hooziewhatsit master
hooziewhatsit master Joined: Oct 2007 Posts: 3,877 Oregon	Quote: Quote: (battery should be 14.4v. If you're seeing 15.2v, you would see 0.6v with this test. If the batt is showing 14.4V & alt is showing 15.2V should the VOM read 0.8V Derp. Math is hard If you ever find yourself in a fair fight, your tactics suck.

Re: alternator over charge 1983 D150 [Re: hooziewhatsit] #1418321 04/12/13 01:57 AM 04/12/13 01:57 AM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	I wanna do your test & just wanted to have it right live every 24 hour block of time like it's your last day on earth

Re: alternator over charge 1983 D150 [Re: RapidRobert] #1418322 04/12/13 02:57 PM 04/12/13 02:57 PM
Joined: Jan 2003 Posts: 32,918 Grand Prairie,Texas stumpy OP I Win
stumpy OP I Win Joined: Jan 2003 Posts: 32,918 Grand Prairie,Texas	Ok voltage drop test shows .59. Voltage at the VR red (top) terminal is 14.75 and gren wire 0 with motor off key on . Running the red shows 14.75 and the green keeps cycling from 8-10.5. Amp gauge shows discharge with the lights on but never shows a charge. Volt meter on dash shows 15+ and flickers and the VOM shows 15.8 at the battery. I also noticed when you start the engine the volt meter will sit at battery voltage for a second and then climb to 15+. Just to be clear the power feed doesn't go through the amp gauge like the older trucks. Ignition switch is new and bulkhead connector shows no corrosion. Could a bad diode or something in the alternator be causing this?

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