Re: overcharging nightmare help
[Re: hooziewhatsit]
#2086310
06/05/16 12:19 PM
06/05/16 12:19 PM
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Joined: Aug 2003
Posts: 1,578
KOS
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supercuda covered it pretty well. The sense line (blue wire) goes from the battery, through the bulkhead (twice), through the ignition switch plug (twice), through the ignition switch itself, and maybe another connection or two along the way. Any or all of those can be less than ideal. My solution was to mount a relay under the hood, have the old blue wire trigger it, and run a new wire through the relay to the alternator/ignition subsystem. No more overcharging for me. Edit: if you do find a large voltage drop, you can temporarily install a jumper from the battery + to the blue wire at the alternator to bypass all of the voltage drops. That should immediately bring your charging voltage back down. Note that it will no longer turn off with the key while this jumper is in place so it looks like i found a voltage drop in the blue wire......so i could temporarily run a wire from + battery terminal unplug blue wire at alt and plug in + battery temp wire correct?
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Re: overcharging nightmare help
[Re: Andrewh]
#2086335
06/05/16 12:53 PM
06/05/16 12:53 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
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Lincoln Nebraska
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the blue wire ign1 (run) circuit T's & goes to one of the alt field terminals and to the top nub on the reg. I'd take all field wires off & jump 12V from batt positive post to alt and reg blue field wire terminals. connect green wire alt field terminal to side reg terminal. jumper alt and reg case and eng block to batt neg post. run it at a fast idle & see what the voltage is. this takes ALL wiring out of the picture & confirms the hard components are good or not (ex for a possible loose connection in the alt) but we gotta make some progress pinning this down
live every 24 hour block of time like it's your last day on earth
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Re: overcharging nightmare help
[Re: KOS]
#2086365
06/05/16 01:20 PM
06/05/16 01:20 PM
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KOS
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Andrewh yes thats exactly how i wired the relay.......so let me get this right id go directly from the alt to output side of relay then trigger side to blue at bulkhead correct?
Robert ill have to pick up some more wire then ill give that a try...thx guys
Last edited by KOS; 06/05/16 01:26 PM.
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Re: overcharging nightmare help
[Re: KOS]
#2086447
06/05/16 03:20 PM
06/05/16 03:20 PM
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Joined: Feb 2003
Posts: 8,761
Andrewh
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stole someone elses drawing and modified. So as long as you caught the wiring way back where I show it. Before it splits to the balast and VR, then you did it right. There is just an issue with the wiring to the alt from the regulator. You probably shouldn't wire directly for power from the alt output. I would do it to the battery instead. To the relay that is, as shown in the drawing. ground can be anything but I prefer to run all the way back to the battery.
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Re: overcharging nightmare help
[Re: KOS]
#2086619
06/05/16 08:40 PM
06/05/16 08:40 PM
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Joined: Apr 2003
Posts: 921 Long Island, NY
shocktrp
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I have a similar problem. New battery, new alternator (last one wasn't charging at all). Car now charges at 17.5V at idle, 18V as soon as you tap the throttle. Changed regulator, same problem. Figured I would change the regulator plug next. Took apart the wiring harness (the last guy must have used several rolls of tape on everything he could find). Green wire goes straight to the alternator with no splices. The blue wire had a splice for the electric choke, & then had another splice (near the back of the manifold on the passenger side) to the blue/white stripe wire that goes to the top passenger side of the ballast resistor. Before I clean this up & move on, is this supposed to be like this or should they be completely separate wires?
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Re: overcharging nightmare help
[Re: Andrewh]
#2086750
06/05/16 11:36 PM
06/05/16 11:36 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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Shocktrip, the blue ign1 (run) circuit can power several circuits such as ECU/upstream side of ballast/elec choke & others. Not an issue if the connections are well soldered. only run it for several seconds just long enough to take a reading on your meter to see if the change you are making is restoring the charging rate as that high will damage things in short order. KOS, if it runs in crank then dies when you release the key, what is being fed in ign2 brown wire "cranking" must also be fed in ign1 "run" tho with a 4 terminal "dual" ballast/5 pin OE ECU (has a functioning 5th pin, the reg/green terminal also needs to be fed in crank but if I read this right it starts in crank then dies in "run". see why you dont have fire in "run" at the coil positive terminal and the blue/yellow wire/terminal at the ECU (check ballast for continuity/ohms first),
live every 24 hour block of time like it's your last day on earth
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Re: overcharging nightmare help
[Re: Andrewh]
#2087018
06/06/16 01:28 PM
06/06/16 01:28 PM
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Joined: Aug 2003
Posts: 1,578
KOS
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Well if you do that, it will be able to test if that is the issue. But it isn't a fix, as your car will not shut off.
It seems like you need to route a new blue wire to the alt from the relay directly.
but I think we might back up a little.
so the blue wire coming out of the bulkhead connector is supposed to be 12 volts.
This line supplies 3 things. The VR- sensing line. Alt- Other field line Ballast resistor- 12 volts during running that the ballast turns into 8 volts or so.
How you wired the relay will help determine where the drop is.
You should have cut the blue wire coming out of the bulkhead. Wired that to trigger the relay and the output of the relay should have gone to the other side/ the end of the blue wire you cut off. If that makes sense.
If you did that and you still have that big a drop to the alt field wire, then as I said, I would just run a new field wire directly from the relay to the alt.
You can hack out the old one from your harness later to see where the issue is. It could be as simple as the connector is going bad. Or you might have some corrosion inside the line somewhere.
Since it is spliced in pretty far up, do not just leave it hanging or you will catch a dead short somewhere. unless you can find the splice in from the factory and remove that line.
That line splices in near the VR where the sensing line goes into the VR. i found the splice so i can disconect it.....how would i wire the alt to the relay direct?? what about the vr and ballast how would they get power now?please explain in detail....
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Re: overcharging nightmare help
[Re: Andrewh]
#2087098
06/06/16 03:36 PM
06/06/16 03:36 PM
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Joined: Jan 2003
Posts: 2,094 central texas
krautrock
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central texas
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So just like the wiring diragram I showed. on the power out of the relay, you can tie all 3 lines together. 1 wire to the vr sensing line. 1 wire to A field of the ALT. and 1 wire to the supply side of the ballast. yes running three wires from the relay output will work fine. if your only voltage to the ballast will be from the relay, be sure that you tie yr ign1 and ign2 wires together on the relay trigger if that's where you are going to pull yr switched power from.
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Re: overcharging nightmare help
[Re: Andrewh]
#2087413
06/06/16 11:10 PM
06/06/16 11:10 PM
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Joined: Aug 2003
Posts: 1,578
KOS
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So just like the wiring diragram I showed. on the power out of the relay, you can tie all 3 lines together. 1 wire to the vr sensing line. 1 wire to A field of the ALT. and 1 wire to the supply side of the ballast. ok did that and also bypassed the blue alt wire where volt drop was put fresh wire in no volt drop now fired the car and still overcharges....
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Re: overcharging nightmare help
[Re: KOS]
#2087414
06/06/16 11:12 PM
06/06/16 11:12 PM
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Posts: 14,889 up yours
Supercuda
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What voltage are you seeing?
Still 16-17V?
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 nightmare help
[Re: KOS]
#2087429
06/06/16 11:27 PM
06/06/16 11:27 PM
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Joined: Aug 2003
Posts: 1,578
KOS
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