Question about Oldsmobile 88

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Alternator will not put out a charge when my 1995 olds royale is running.

When bench checked the alternator puts out 14 volts. The red wire, single wire plug that plugs into the alternator when installed on the car, does not have a current when the ignition key is turned on. The voltage light on the dash does come on when the ignition key is turned on. The single plug (Red Wire) has continuity back to where it comes out of the ECM. I can't locate the brown wire that comes from the dash light to the input side of the ECM. Are there any schematics for the ECM wireing, or inline fuses between the dash light and the ECM input plug?

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  • Oldsmobile Master
  • 11,469 Answers

Http://www.bbbind.com/free_tsb.html Free wiring diagrams . Enter your vehicle info. year , make , model and engine size will fill in automaticly . Under system click on engine then under subsystem click on charging system . Click the search button then on the blue link .

Posted on Apr 29, 2017

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6ya6ya
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Posted on Jan 02, 2017

short shadey
  • 421 Answers

SOURCE: 1988 jeep wrangler no fuel

check your fuel pump relay and your ignition switch those numbers you gave for voltage are not right, please recheck that you have a ground and 12volts at the pump while cranking please rate -jeff

Posted on Sep 04, 2008

  • 521 Answers

SOURCE: battery voltage is very high when driving over 14

Voltage regulator is going bad. Have alternator tested or go ahead and have it replaced. Also this would be a good time to have the battery tested. Usually an alternator that is over charging will "cook" the battery causing it to not charge, not hold a charge, to losing the gel/electrolyte solution due to boil out.

Posted on Jul 17, 2009

  • 583 Answers

SOURCE: Will not charge

you will get some funny answers from some of these "experts " The symptoms suggest to me with out much doubt that the regulator is not doing its job correctly ,consistently.Iwould take it to an AUTO ELECTRICIAN and get it tested in situ.... there is only 4 things it can be , wireing ---battery---alternator-----regulator and of those the reg. is the only one that chops and changes. it will cost little for a sparky to check the reg ,. AND I WOULD LIKE TO KNOW THE OUTCOME

Posted on Oct 22, 2009

  • 6 Answers

SOURCE: 84 CK TRK, 2500, 5.7L 55,000 miles have replaced

On some of the older style GM's you can take that brown wire and cut it and take the end leading from the alternator and hook it directly to the hot terminal on the alternator and just leave it hooked up and it will work. But I have ran into the occasional problem where leaving it hooked up will drain the battery when the vehicle isn't running. Hope this helps..

Posted on Oct 25, 2009

Testimonial: "I fixed the problem - the terminal at the brown wire was corroded - after cleaning and recrimping - everything works - thanks for the heads up"

alicantecoli
  • 22133 Answers

SOURCE: Starts and dies on acceleration then will not run

try pouring some neat petrol into manifold and if it fires we can go from their .

Posted on Nov 15, 2009

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How do you know it's only putting out about 1/2 ? an 1/2 what ? Amps or volts ? Did you hook up a volt meter to the battery posts ? red to red an black lead to negative post of the battery ? Does it show 13.1 to 14. 1 volts with the engine running , if so it's charging . The only thing that would cause the alternator not to put out full charge amps would be a bad diode inside the alternator or a power or ground issue. You need to check power an grounds doing a voltage drop test . Voltage Drop Testing the Charging System

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1998 isuzu trooper need wiring diagram for charging system with a3.5 li5ter motor


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Check main 80 amp fuse in engine compartment and also check fuses in inside fuse box, there two in that one. first is engine fuse 15amp and the 10amp gauge fuse,

Here is the wiring diagram for the charging system as you asked for , also check connections, follow battery wire off the back of alternator make sure connections are good , that wire runs to engine fuse box and that is one fuse that i said to check it is 80amp, hope this is helpful good day9_30_2012_10_15_05_pm.gif

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Alternator put in and the car won't start and dead new battery'


I am taking it you have a new battery. You put on a alternator. Now you need to charge the battery until it is fully charged. That way the car will run for a while before it stalls from undervoltage. With the battery charged check the voltage at the battery. It should be 12 to 13 volts. Now start the car and check the voltage it should be up to almost 14 volts. If that is good check with lights and heater blower on should be at least 13.5 volts. If the voltage does not increase you either have a bad alternator or it is not getting excited by the ignition switch on the vehicle. So you should find the wire that energizes the alternator and turn the key on it should have 12 volts on it. Hope all this helps. please rate my answer so I get points.

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I put a new battery and a new altenator,and the red battery light still on, I've check it with a tester it stays at about 10 volts


Your alternator should putting out 14-14.6 volts with engine running.If you only have 10 volts with engine running then your alternator is not charging take alternator back for a replacement.

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Red battery light on dash ford 1999 expedition battery tested 12 volts not running with all electrical on and engine running 14 volts at battery terminals


Charging is sufficient you want 2 volts above battery, for that dash to be on there will be a terminal on the alternator that is not connected it is a single wire you will need to make sure that it is connected,the terminal have tendency to break off and sometimes people who put the alternator on forget to put that terminal on they just dont see it it a wire by itself

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1 Answer

How do i test the alternator before replacing.The battery doesnt seem to charge.


With the car running use a volt meter set on DC volts put each lead on its matching color on the battery(red to red, black to black.) meter should read 13-14 volts you can also go from negative to the large wired usually red terminal on the alternator, whichever is easier.
Also the battery light should come on in the car if not charging (but not always if alternator is weak but not dead).
Also old school method is start car. Loosen negative battery cable if engine dies then alternator is not working.
Finally go to parts store and they will put machine on the battery which will give you an answer. They do it for free. I prefer the other methods first I find them more reliable but in a pinch run to a store and at least youll have a quick idea.

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1 Answer

My battery is fully charged, the alternator is new. if i disconect the battery the truck will shut down....What do i need to check for???


First off, never disconnect battery when vehicle is running. It could stress out the alternator and blow the diodes. Now you need to put a volt meter on the battery while the vehicle is running to see if the alternator is putting out 14 volts. If its putting out 12 or less, you have likely blown the alternator. Remove alternator and have tested free at Orielys or napa. I dont trust autozone.

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3 Answers

Will not charge


you will get some funny answers from some of these "experts " The symptoms suggest to me with out much doubt that the regulator is not doing its job correctly ,consistently.Iwould take it to an AUTO ELECTRICIAN and get it tested in situ.... there is only 4 things it can be , wireing ---battery---alternator-----regulator and of those the reg. is the only one that chops and changes. it will cost little for a sparky to check the reg ,. AND I WOULD LIKE TO KNOW THE OUTCOME

Oct 21, 2009 | 1983 Buick Skyhawk

3 Answers

Somerset Alternator


the voltage regulator is internal on that alternator. Take the alernator back off and take it autozone or advance and have them bench test it to see if its good or not. That model car doesnt have a fuse for the alternator either and the regulator is internal on that model. Thats a standard sg gm alternator. those above stores do not charge for testing it for you. another quick way if you have a volt meter is black end of volt meter to the negative battery cable and the postive end of the meter to the thick red wire on the alternator that you had to put the nut on. then with car running that should show 13 to 14 volts. If not, suspect that alternator. But try the free check on it before going through too much more grief with that. if you had it tested. take the whole car to the autostore and ask them to check it while the car is running, Autozone and advance both have the machine they will take out to the car and check it for free. Otherwise, get a volt meter and check it as I said. If the alternator is putting out, then you have a bad cable or the 'field' wire is bad.

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