Re: b body charging system..
[Re: cwilson66]
#2823191
09/21/20 09:58 AM
09/21/20 09:58 AM
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Joined: Jan 2003
Posts: 10,666 North Dakota
6PakBee
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it had the old style regulator with the dual field square back alt.. it worked 10 years ago but after firing up the new engine it wasnt charging i had the alt tested -ok so i replaced the old regulator with a "new" style one. rewired it and it was charging at 13.5 at idle-perfect
It sounds like when you rewired it you missed something As a minimum you have to run an additional wire from the alternator to the voltage regulator when you change from the grounded field to the ungrounded field alternator. Charging Circuits
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: b body charging system..
[Re: cwilson66]
#2823244
09/21/20 12:32 PM
09/21/20 12:32 PM
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Joined: Jan 2003
Posts: 10,666 North Dakota
6PakBee
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sounds like you may be right... i can take it apart and have a look but still strange how theres continuity between either field terminal and the case? Not strange at all. If one terminal is grounded, there is direct continuity. The other terminal is grounded through the field winding to the other field terminal which is grounded, indirect continuity if you will.
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: b body charging system..
[Re: cwilson66]
#2823247
09/21/20 12:35 PM
09/21/20 12:35 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
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Circle Track
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Lincoln Nebraska
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it had the old style regulator with the dual field square back alt.. it worked 10 years ago. so while idling if i unplug the blue field wire from the alt it stops charging, the green wire seems to have no effect weather its plugged in or not. now with both blue and green field wires unplugged engine off, if i test for continuity between bat neg and either field terminal on the alt i have continuity, is that normal? I'm missing something cuz the 2 field terminal alt would not work with the old style "box" reg but you said it was charging in the 13's way back so I missed something there. DO you have the flat one or the box? if either of the male field terminals on the alt are grounded then there is an alt issue, as said start by checking the brushes, grab your vom. EDIT I see that you have the later system (flat reg), something inside the alt is grounded with there being continuity from one or both alt field terminals to the batt neg
Last edited by RapidRobert; 09/21/20 12:40 PM.
live every 24 hour block of time like it's your last day on earth
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Re: b body charging system..
[Re: 6PakBee]
#2823254
09/21/20 12:46 PM
09/21/20 12:46 PM
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Joined: Sep 2003
Posts: 19,239 north of coder
moparx
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"Butt Crack Bob"
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north of coder
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sounds like you may be right... i can take it apart and have a look but still strange how theres continuity between either field terminal and the case? Not strange at all. If one terminal is grounded, there is direct continuity. The other terminal is grounded through the field winding to the other field terminal which is grounded, indirect continuity if you will. i had a cracked brush holder do that to me one time. when i discovered it and took the holder out, it broke into pieces.
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Re: b body charging system..
[Re: 72roadrunnergtx]
#2823279
09/21/20 01:14 PM
09/21/20 01:14 PM
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Joined: Apr 2003
Posts: 12,188 Looking for a way out of Middl...
IMGTX
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OP " the green wire seems to have no effect weather its plugged in or not." This statement in the original post would eliminate anything external to the alternator brushes. I missed that one. Sounds like a bad alternator (Internally grounded field) or there is a hokey wiring setup that wasn't described but I believe him when he says it was wired correctly. Disconnect both field wires from the alternator. If there is a connection from the terminals to the alternator case there is a short.
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Re: b body charging system..
[Re: IMGTX]
#2823344
09/21/20 03:50 PM
09/21/20 03:50 PM
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Joined: Aug 2007
Posts: 6,089 Valencia, España
NachoRT74
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Valencia, España
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if one of the brushes is grounded ( intentionally or accidentally ) we must say thanks God is not the one getting the blue wire, because if so, will inmediatly short out and burn the wire as soon you put the key in RUN.
With a Charger born in Chrysler assembly plant in Valencia, Venezuela
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Re: b body charging system..
[Re: NachoRT74]
#2823367
09/21/20 04:56 PM
09/21/20 04:56 PM
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Joined: Apr 2003
Posts: 12,188 Looking for a way out of Middl...
IMGTX
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if one of the brushes is grounded ( intentionally or accidentally ) we must say thanks God is not the one getting the blue wire, because if so, will inmediatly short out and burn the wire as soon you put the key in RUN. Very Very true It's still important to disconnect both field wires when checking for shorted fields. If you leave the blue one hooked up when checking for a shorted field you will almost always get a false positive. The blue wire also directly, or indirectly, connects to solenoids, coils and such so it will tell you there is a ground when it is just current finding its way home through another device. My apologies if I didn't explain why.
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Re: b body charging system..
[Re: cwilson66]
#2823437
09/21/20 08:30 PM
09/21/20 08:30 PM
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Joined: Oct 2008
Posts: 765 Shoreline, Washington
72roadrunnergtx
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super stock
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Shoreline, Washington
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You were seeing continuity through the field winding to the grounded terminal from the insulated terminal. And as mentioned, connecting the blue wire to a grounded terminal normally results in a lot of burned up wiring, you’re lucky it stalled it first. Find a fiber washer for the grounded terminal screw, problem solved.
Last edited by 72roadrunnergtx; 09/21/20 09:06 PM.
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Re: b body charging system..
[Re: cwilson66]
#2823686
09/22/20 04:06 PM
09/22/20 04:06 PM
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Joined: Apr 2003
Posts: 12,188 Looking for a way out of Middl...
IMGTX
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so the field terminal with out the plastic washer is grounded to work with the pre 1970 regulator, make sence?
with the car running when i would go to plug the blue wire in it would spark you would hear the idle drop slightly and it would be charging ar 15 volts up to 18 off idle. i decided to try plugging the blue wire onto the other field terminal and it instantly shut the car off.. What you did was unknowingly ground the blue wire. The blue wire is the positive field wire which also connects to the ignition system, various solenoids and such. The only fuse in the blue wire circuit is the fusible link. Check the fusible link for damage. that was my over sight, however the other field terminal with the plastic washer still has continuity to the alt case its self, The field (Rotor winding's) inside the alternator is just a large continuous coil of wire. If either end is grounded then both ends will be grounded.
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