Question about 1987 Nissan King Cab

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Volt meter in s reading almost 16 volts - 1987 Nissan King Cab

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Your voltage regulator needs to be adjusted to 14.5 volts or if it won't adjust you need to replace the regulator. If you have a bad ground it could make the alternator see the wrong voltage and cause it to go to full charge. If it haas a built in regulator you can buy it at an alternator shop and replace it it is help in place by screws. It would be helpful if you tell us what year and make of car. Some put out as much as 26 volts. so more input is better, also please rate this if you need more help.

Posted on Jul 15, 2009

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What is the right output from alternator. My is charging 15.0.Is that to much or it is ok


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My voltmeter reads out 16/17 on my 94' Buick Park Ave. will this kill the battery?


Yes. Some voltmeters read higher volts when the voltmeter battery is low. Use a different voltmeter or put a fresh battery in the volt meter or test voltmeter against a known dc voltage to see if the reading is accurate. After this start thinking it is the alternator regulator.

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Battery drains while sitting


Hi Anonymous, perform the following tests:
1. Fill acid type batteries to proper levels.
2. Charge battery overnight at 1-2 amps you need 12.5 volts or better after charging.
3. Hook up battery positive cable, then with your multimeter on the milliamp scale connect one lead to the negative battery post and the other lead to the ground cable. Meter should read 3 milliamps or less, 10 milliamps with a radio, 15 milliamps with radio and CB. If your meter reads higher you need to isolate the circuit by pulling fuses and circuit breakers one at a time and observe meter for drop in aprerage then get out your test light and track down the short in that circuit.
3. Make sure all connections are clean and tight especially the negative cable at "BOTH" ends.
4. Hook up volt meter to battery and start engine, if meter falls below 9.5 v while cranking replace battery.
5. With engine running at 3600 RPM battery should read 14.3-14.7 volts if not continue tests.
6. Unplug voltage regulator from alternator at crankcase by front of primary cover.
7. To test voltage regulator go to: https://www.youtube.com/watch?v=F8EjV0IjW9Q
8. With ohm meter, one lead grounded, touch alternator pin meter should read infinity, if not replace stator.
9. With ohm meter, both leads touching alternator pins meter should read 0.1 to 0.2 ohms on 1989 and later models. 0.2 to 0.4 ohms 1988 and earlier models, if not replace stator.
10. With volt meter set on AC scale, both leads touching alternator pins meter should read
16 to 20 volts AC for every 1000 RPM'S 1989 and later and 19 to 26 volts AC for every 1000 RPMS. If not replace rotor.
17. For a free wiring diagram please visit the website below. Good luck and have nice day.
Harley Davidson Wiring Diagrams and Schematics

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2 Answers

What should the voltage guage read


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When the Jeep was new the volt meter read 14 volts....now the volt meter reads 13 volts with a one year old battery. Since the battery is a 12 volt battery should there be any concern that the volt meter...


It needs to be looked at,hook a volt meter to the battery,and start the engine,turn the ac on high blower,and the head lights on,the alternator should be putting out 13.65 volts to 14.25 volts,if it is any lower than this,replace the alternator,now,if the reading is not the same as in the vehicles volt meter,then the cables,positive and negative need to be replaced,the cables get old,and corrode on the inside and break down,they do not carry the current as they should.Shuold you decide to replace them,go with a larger diameter cable,both positive,and negative.

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1 Answer

No trailer lights to the plug at all. it has a tow package, could be be a fuse


What type of vehicle? What type of plug (4-way, 6-way, 7-way)? Could be a fuse. Did you put a volt-meter to the plug socket to check for power? Make sure the running lights are turned on, someone's pressing the brakes, and put the flashers on before you use the volt meter. Could be a bad ground on the vehicle or trailer. If it's a 7-way, the plug on the trailer end could be worn and need replacing. The socket on the truck could need replacing. If it's not a fuse and your volt meter gets no reading at the socket, take the socket off and check each wire with the volt meter. If you get readings, it's the socket. If you don't get readings, the problem is before the socket.

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Looking to find the correct specs to adjust a TPS for a 1994 Mazda 929. Using a multi-purpose voltmeter.


YOU NEED 2 VOLT METERS.FIRST OF ALL START ENGINE.LET IT GET OPERATING TEMPERATURE THEN TURN OFF ENGINE.THEN YOU CONNECT TWO VOLT METERS TO THE TEST CONNECTOR.TURN IGNITION ON AND CHECK THAT CURRENT FLOWS TO ONLY ONE VOLT METER.IF BOTH VOLT METERS SHOW CURRENT FLOW REMOVE THE CAP AND TURN THE ADJUSTING SCREW COUNTERCLOCKWISE UNTIL ONE VOLT METER SHOWS CURRENT.IF NO CURRENT IS REGISTERED BY EITHER VOLTMETER TURN THE ADJUSTING SCREW CLOCK WISE UNTIL ONLY ONE VOLT METER SHOWS CURRENT.INSTALL THE CAP ON THE ADJUSTING SCREW AND DISCONNECT THE THROTTLE SENSOR CONNECTOR.CONNECT AN OHM METER TO THE THROTTLE SENSOR TERMINALS.OPEN THE THROTTLE VALVE AND CHECK THE RESISTANCE READING FROM THE THROTTLE SENSOR.AT IDLE THE THROTTLE SENSOR SHOULD SHOW ABOUT ONE KILO OHM RESISTANCE.AT WIDE OPEN THROTTLE THE SENSOR SHOULD SHOW ABOUT 5 KILO OHMS RESISTANCE.ANY RESULTS OTHER THAN THESE.REPLACE THE THROTTLE SENSOR AND RETEST.

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Service Charging System


DONT START THE CAR///IGNITION ON//PRESS THE GAS PEDAL DOWN 3 TIMES SLOWLY//THEN START THE CAR. THAT RESETS THE COMPUTER AND THE CHARGING SYSTEM WARNING LIGHT.

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1 Answer

24 volt charging problems .2 12 volt batteries 1 battery 16volts and the other about 9-10 volts


A 12 volt battery is actually 13.2 volts fully charged. If you are reading 16 volts, you are probably getting extranious voltage from the system somewhere, especially if the vehicle is running when you check the voltage. The alternator will put out about 15-18 volts to charge the battery normally, and yours may put out 28-32 volts to charge them in series, but the batteries, when disconnected, should never read more than about 13.2 volts each. Typically, it will read about 12 1/2 volts when disconnected. COMPLETELY DISCONNECT BOTH OF THE BATTERIES. If you still read 16 volts when it is disconnected, you must have a bad meter because the battery can't produce that much voltage, no matter what. (Six 2.2 volt cells connected in series inside the case.) Put the meter on a known good battery on another car that is not running and see if you get the same reading. It sounds like the other battery is almost dead, regardless, and it sounds like your series/parallel switch may be malfunctioning. (That is the switch that puts the battery in series to run the 24 volt starter, then puts the batteries in parallel to run the remainder of the vehicle on 12 volts. This is all assuming that you have a diesel vehicle with a 24 volt starter and that is why you have two batteries.

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