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I was wondering if anyone new where the Voltage Regulator is on 1984 Nissan 720. Part store says it is not on the alternator.

Truck has been sitting for over 17 years. We got it going but we are having trouble getting it to charge right. When truck starts it takes about a min to start charging. Once you turn headlights or heater just really any draw from it it quits charging. We have checked all wires everything is good. Only thing we can think of is the Voltage Regulator. Lasyt night I started truck and took cable off battery. It showed to be charging better with out battery but same thing happens when something is drawing power but when you honk horn when lights are on and still battery disconnected the lights get brighter. Both the battery and the alternator are new.

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Check the connections all around for corrision like the connections too and from the alternator and starter motor and its solinoid and battery and its negative and replace the battery with a new one the regualtor doesnt exist its done by the alternator intergal so will be some bad connection break all and clean off the oxides and try again before you waist your time with regulators ie why would it fail /?? its under no stress ... so most often just water ingress and oxides.. on contacts

Posted on Nov 28, 2014


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SOURCE: 1996 tahoe won't start

double check battery under load and verify it will hold for 10 seconds without dropping out under 10.5 volts , very possible there is a draw somewhere , check this by pulling fuses one by one with amp meter connected until you see maybe .3 volts .1 volt is normal

Posted on Feb 19, 2009

  • 232 Answers

SOURCE: truck won't start

You should check your battery cables with an ohmmeter and see if they have any resistance,they should be at 0 ohms or just alittle over,but could possibly be the starter solenoid also.I had this same problem with my Toyota last year,hard starting sometimes needed a jump and then the alt went bad,turned out to be the solenoid was shorting intermittantly.Hope this helps.

Posted on May 05, 2009

  • 14036 Answers

SOURCE: 97 Chevy Blazer - good battery, good alternator...still dies???

check battery voltage when you turn off car. it should be 12.5 volts.if drops 11.0 volts the battery is got a weak cell in it.i bought a sears die hard battery it last 2 years the battery had a defect .it had a bad cell it short out the battery.check alternator wires for defects.

Posted on May 29, 2009

  • 6 Answers

SOURCE: battery not holding charge,

change your alternater

Posted on Sep 21, 2009

  • 4803 Answers

SOURCE: I have a 1984 dodge D150, not charging, battery is

The first thing you need to do is stop wasting your money by replacing parts. Then get a volt-ohm meter and a test light to test the circuits between the battery, the alternator, the ignition switch, the starter relay and the voltage regulator. (a.k.a. Charging System Circuits)

To start, the "B+" or "BATT" terminal on the alternator (large black wire) MUST have a solid, direct connection to the battery. Check for the proper voltage here. Then, the red wire on the alternator at the "F2" terminal should be HOT at all times. If not, you probably still have a bad fuse link that you missed. The "F1" terminal on the alternator (Light Green wire) is known as your "FIELD" wire. It comes from the "IG" terminal at the voltage regulator. It should be hot any time the key is in the ON position. If not, your voltage regulator is not working or your ignition switch is not providing power to the regulator. Finally, The "F" terminal (Red wire) at the regulator should be hot any time the ignition switch is in the ON position. This actually gets it's power from the starter relay, which gets its power from the ignition switch.

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