68 charger, charging issue.
#793455
09/05/10 03:38 PM
09/05/10 03:38 PM
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Joined: Aug 2004
Posts: 3,310
Walnut Creek, CA
blown340
OP
master
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OP
master
Joined: Aug 2004
Posts: 3,310
Walnut Creek, CA
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Hi All, my dad's 68 charger isn't charging. The car is a original one owner 318 car and isn't modfied at all. The issue came up after a motor rebuild and I haven't been able to trace the problem. Both the alternator and the voltage regulator are new. Any input would be appreciated! Here's what I've done so far.
Alternator ground is good with continuity verified between the alt case and the battery neg terminal.
Voltage Regulator ground is good with continuity verified between the case and the battery neg terminal.
If I run a jumper from batt + to the alt field terminal it starts charging.
With the car at idle I have 2.x volts at the field terminal when its connected to the alt. (couldn't read my note on what the .x was exactly)
With the car at idle I have 8.5 volts on the field wire when it is not connected to the alternator.
The field wire has good continuity from the alternator plug back to where it connects to the voltage regulator.
The alternator is a roundback unit, however It does appear to have two places where a field wire could attach. I'm not sure if thats normal or not for the 68 unit as I don't have the old one around.
Thanks for any and all input!
-Jon
70 challenger convertible. 340/5 speed. blown, intercooled, efi, blah blah blah
71 valiant scamp 318/A833OD/AC/PS
00 dakota RC 4.7L 5 spd autoX'r. SRT10/T56 swap in process
73 W200 Power wagon, PTO winch, 4 spd
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Re: 68 charger, charging issue.
[Re: stumpy]
#793457
09/05/10 04:18 PM
09/05/10 04:18 PM
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Joined: Aug 2004
Posts: 3,310
Walnut Creek, CA
blown340
OP
master
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OP
master
Joined: Aug 2004
Posts: 3,310
Walnut Creek, CA
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Quote:
If the alternator has two male wiring terminals then you need two wires going to them. If I remember correctly one blue and one green. It makes no difference which goes to what terminal.
Thats the thing, the car only has a single field wire. Is there such a thing as a dual field roundback?
Edit: Looks like I ended up with a 69+ roundback instead of the 69- I needed. "The first alternators used on Chrysler products was made by a company called Essex. The Essex brand Chrysler alternator can be identified by the wide spacing of the fins on the front and rear frames and will also have the Essex symbol cast into both of the frames. For the 1963 model year Essex continued to make the alternators for Chrysler, however they added more fins to the frames to give it added strength. Essex also produced the first mechanical voltage regulators for Chrysler and had the Essex symbol stamped into the metal case of the voltage regulator too. These were all single field, "B" circuit alternators. By 1964 Chrysler was ready to manufacture their own alternators which looked like the Essex brand but no longer carried the Essex symbol that was cast into the frames. These were produced in 37, 46, and 60 amp versions and all looked the same on the outside. Chrysler still retained the same "B" circuit, single field wiring design through the 1969 model year. In 1970 electronics were starting to come into their own and we started to see the electronic voltage regulator. When Chrysler went to the electronic voltage regulator the wiring design changed from the single field "B" circuit to the double field "A" circuit, which now had two field terminals on the back of the alternator. The frame design stayed the same and another terminal was added for the second field. This style alternator stayed in production through the 1971 model year. For 1972 Chrysler redesigned the alternator. The front frame stayed the same, but the rear frame changed considerably. Instead of the can type pressed-in diodes used in the earlier alternators, they now had a positive rectifier and a negative rectifier each containing the three diodes. These were bolted to the rear frame as two separate assemblies which made a common electrical connection that the stator windings also connected to. This style of alternator greatly improved the repair aspect as no soldering was needed to join all of the diodes and stator windings."
70 challenger convertible. 340/5 speed. blown, intercooled, efi, blah blah blah
71 valiant scamp 318/A833OD/AC/PS
00 dakota RC 4.7L 5 spd autoX'r. SRT10/T56 swap in process
73 W200 Power wagon, PTO winch, 4 spd
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Re: 68 charger, charging issue.
[Re: generallee6901]
#793459
09/05/10 05:11 PM
09/05/10 05:11 PM
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Joined: Aug 2004
Posts: 3,310
Walnut Creek, CA
blown340
OP
master
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OP
master
Joined: Aug 2004
Posts: 3,310
Walnut Creek, CA
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Quote:
Run a wire from the other terminal to ground and it should charge.I usually run it to the alt. bracket or to the engine.
Is that a permanent solution, or is that just for testing purposes?
Thanks,
-Jon
70 challenger convertible. 340/5 speed. blown, intercooled, efi, blah blah blah
71 valiant scamp 318/A833OD/AC/PS
00 dakota RC 4.7L 5 spd autoX'r. SRT10/T56 swap in process
73 W200 Power wagon, PTO winch, 4 spd
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Re: 68 charger, charging issue.
[Re: blown340]
#793461
09/05/10 07:29 PM
09/05/10 07:29 PM
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Joined: Jan 2003
Posts: 1,476
gtx69
super gas
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super gas
Joined: Jan 2003
Posts: 1,476
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Quote:
Quote:
Run a wire from the other terminal to ground and it should charge.I usually run it to the alt. bracket or to the engine.
Is that a permanent solution, or is that just for testing purposes.
That would be permanent.You can ground it to the back of the alternator.
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Re: 68 charger, charging issue.
[Re: gtx69]
#793462
09/05/10 07:37 PM
09/05/10 07:37 PM
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Joined: Aug 2004
Posts: 3,310
Walnut Creek, CA
blown340
OP
master
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OP
master
Joined: Aug 2004
Posts: 3,310
Walnut Creek, CA
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Quote:
Quote:
Quote:
Run a wire from the other terminal to ground and it should charge.I usually run it to the alt. bracket or to the engine.
Is that a permanent solution, or is that just for testing purposes.
That would be permanent.You can ground it to the back of the alternator.
Unfortunately grounding the 2nd fld terminal directly to the battery neg didn't have any effect. 
70 challenger convertible. 340/5 speed. blown, intercooled, efi, blah blah blah
71 valiant scamp 318/A833OD/AC/PS
00 dakota RC 4.7L 5 spd autoX'r. SRT10/T56 swap in process
73 W200 Power wagon, PTO winch, 4 spd
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Re: 68 charger, charging issue.
[Re: gtx69]
#793466
09/07/10 11:39 AM
09/07/10 11:39 AM
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Joined: Mar 2007
Posts: 5,660
Flint, MI
Gusteve
I Love the Unicorn Song!!
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I Love the Unicorn Song!!
Joined: Mar 2007
Posts: 5,660
Flint, MI
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Quote:
Picture of how i grouded mine.
 That's how my 68 is.
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