Question about 1991 Dodge Dakota

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Installed a new alt- not getting any power to the battery,where does the cable go from the alt? where is the voltage regulator?

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The "Batt" wire probably goes to the starter solenoid or starter relay. The wire is most likely corroded off or it's making a poor connection. Some vehicle route the power directly to the battery, look for a fuseable link in the wire. Use a test light too see if you have power on both sides of the fuseable link. There should be power at the "Batt" terminal of the Alt at all times, if not start tracing the wire back to the battery. The voltage regulator is built into the Alt. Hopefully this helps.

Posted on Nov 18, 2009

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Posted on Jan 02, 2017

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How do i fix my voltage regulator 98 dodge ram 5.2 new battery new pcm?


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Just replaced battery.old one went dead overnight but I had never checked voltage, Now, after installing new battery, voltage remains at 14.9 to 15 volts. Will this fry my batt? Is voltage regulater the...


14.9 to 15 volts is normal for a battery and the voltage regulator is built into the alt they dont often make a rebuild kit for alts anymore so buying a new one is easyer but you dont have to do that cause there is nothing wrong with it.

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You may have a voltage drop in the battery feed to the Alternator through the fuse link and into the battery. Check the charge rate at the battery feed on the Alternator, it should be at least 13.8 volts, if it is, locate the fuse link and check it there on both sides of the link, if its still good, follow the cable back to the battery checking the voltage as you go. If you find that the voltage suddenly drops across a connection or the fuse link, remove and clean the connection or replace it if possible. If the voltage at the back of the Alternator is less then 13 volts, then the new Alternator may be faulty. If the voltage is higher then 15 volts, then the Battery feed to the Alternator is bad and MUST be fixed. Check these voltages with the engine running but watch out for moving parts ( fans etc). If you think the battery feed to the Alternator is bad, shut the engine down and recheck the voltage at the Alternator, it should be at least the same as it is across the battery. If there is no power to the Alt when the engine is off, start at the fuse link, checking for voltage and trace back to the alt until you lose the reading. If you get no voltage at the fuse link, track it back to the battery. The voltages at the battery and Alternator should be the same or only have a difference of half a volt, any more and you need to locate and fix the bad connection. DO NOT run the Alternator without the load of the battery for extended periods as this will damage the Alternator. The Alt needs the internal resistance of the battery to function correctly. If the voltages from the battery to the alt are correct, check the regulator wiring. If memory serves, there are two small wires to the alt which are in a small plug into the alt and one thick cable which connects to a bolt on the alt. The thick cable is the battery feed, the two small cables are the regulator feeds. One small cable operates the warning lamp in the dash cluster and the other is another battery feed which gives the regulator an indication of the charge rate AT THE BATTERY so if this one is missing the regulator will also cut out. The warning lamp wire serves as an indication to the regulator that the ignition is turned on and makes the alternator charge. This lamp should be on with ignition on but engine NOT running and should go out when you start the engine. If this lamp does not light up at all, suspect a broken or missing warning lamp connection or faulty regulator.A blown warning lamp bulb will also prevent the alt from working, this is because the bulb is fed with power and is grounded at the alt through the regulator and exciter diodes, feeding the regulator with power until the engine starts, then the alternator output essentially puts power to both sides of the diodes causing the lamp to extinguish. A diode is a one way valve for electricity and the regulator is inside the alt. If you suspect a faulty alt or regulator, remove them and have them checked by an autoelectrician. Unless you know what you are doing, DO NOT attempt to disassemble the alt as you can cause catastrophic damage and have to purchase a replacement alt. You may also void any warranty by disassembling the alt.. Undertake these tests and if you have any questions, email me here: swoop@live.com.au
Dave.

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I have a 1995 Mitsubishi Montero LS. The voltage


easy test on alt start car loosen pos cable.then take off cable from batterie if alt is good it wont cut out.if it does,more than likely your alt. if the belt was the problem it would be noticeable by squealing and audible slipping.and most voltage regulators are built into the alternaters these day.

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1 Answer

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Do you have an alternator with 2 field connections and one power output connection and a separate regulator?
If you do,with the engine running,remove the connection from the regulator and jump across the 2 connections in the wire harness,this will give you full field and the alt should show a charge,use a voltmeter on the battery and watch for an increase in voltage.If voltage increases,the regulator is bad or the reg ground is bad.(try cleaning the mounting bolt areas before replacing it)If no increase in voltage,remove the 2 field connections from the alt and ground one and apply battery voltage to the other with the engine running.You should see an increase in voltage if the alt is good.I am assuming you have battery voltage at the alt power output connection at all times?

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Bought new alternator and installed it and still cuts off if not connected to jumper cables???


its probly not charging or you might want to test the battery might be bad also did you have the old altenator tested check for power to voltage regulator at the alt to see if there is power presnt otherwise it will never charge without that power wire hot with key on engine off.

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2 Answers

Car putting out to high of voltage. New battery in car, now dead.


Usually when the battery light comes on it means there is a problem with the alternator. It means it is putting out less than 12.2-12.5 volts.

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1986 t-bird won't hold charge


Check your Belt and see how tight it is. It may be Tight just not tight Enough to Fully Charge the Battery with the Alternator.

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1995 ford 150, battery keeps losing power while running, alternator and battery checked out OK. battery cables and connections replaced still loses power.


Hi,
Ok then lets start right from the beginning, what to check for:
-- loose battery connection pos and neg
-- loose or broken wires on the alt
-- loose alt belt
-- you said that you had the alt and battery tested? that was a load test?
-- battery could be just no good even if its new, that's why I asked if a load test was done, and the output of the alt is ok?

Try these please let me know then we can go from there.

Cheers

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