Question about 1990 Dodge Ram

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My 1990 dodge truck is not charging. I have power on both sides of the internal voltage reg. But one of the leads coming out of the black box on the top of the alternater is not getting power back to gauge and battery

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  • Dodge Master
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Very good, you pinpointed where the problem is. Try to replace the voltage regulator or the whole alternator with a new voltage regulator included.

This will fix your problem.

Posted on Jul 17, 2010

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Posted on Jan 02, 2017

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Does the ECM control the alternator charging amperage/voltage on a 2004 Suzuki aerio? New alternator only charges @12.5. Won't charge enough to keep ahead of necessary power draw.


Some vehicles are fitted with a smart charging system that is designed to prevent the alternator charging during acceleration to free a few horsepower to help.

My experience of these is very limited but there is an ECU that controls them and the battery, charging or ignition light using information from the engine management system.
The alternator generally has an extra plug with about four or five wires which when disconnected render the alternator a standard machine sensed type.

Japanese vehicles used separate voltage regulators longer than most types. You either need experience or a wiring diagram for good fault diagnosis but mostly it is unnecessary to check the charging current of an alternator which bears little significance unless being tested with a graduated load or adjustable carbon pile.

The current output of a healthy alternator is dependent on the terminal voltage of the battery which in turn is dependent on the electrical load placed upon it. Switching on the lights should lower the voltage and increase the alternator output. If the battery is particularly good the voltage won't fall very much and the current won't increase as much as expected...

Measuring the battery voltage with the engine running at about 2000/2500 rpm is sufficient for most purposes. With nothing switched on and a fully charged battery it should be around 14.5 volts and with everything switched on (lights, HRW, heater fan, etc.) a healthy alternator should continue to maintain a voltage above that of a healthy fully charged battery (13.2 volts).

If the voltage isn't maintained on load the charging system, probably the alternator, is faulty and should be independently tested.

Jan 25, 2017 | Suzuki Cars & Trucks

1 Answer

How do you change the computer on a 1990 dodge dakota?


the 1990 dodge Dakota came with two different charging and two different fuel delivered systems. If it had it a Bosch alternator the voltage regulator is built into it. Denso type with external voltage regulator with the voltage regulator is on the fire wall of the truck and may be the problem . Some part stores list the alternator for the for the external regulator don't list the Bosch internal regulator alternator at all for what ever the reason. And if they do the Bosch replacement will be higher in price (I found Nappa online store to have a better listing than some other parts listing) so back to your question replacing the CPU disconnect the Battery on the right side of truck just in frount of finder well you will see a black module with a air intake hose running to it this is the SUCB (single unit control board) remove the wiring plug by unscrewing the center screw and pull it free unscrew the 4 mounting screws and you are discounted this unit is sealed and will need to be replaced if replaced with one from a salvage yard make sure it is the same carbureted and fuel injection are different also 2 wheel drive and 4 wheel are different

Aug 18, 2014 | 1990 Dodge Dakota

2 Answers

Trying to find voltage regulator for a 1990 dodge 150.its not on the fire wall


Almost all voltage regulators are part of the alternator now.

May 29, 2011 | 1990 Dodge D150

1 Answer

Were is the voltage regulator and the asd relay


Gas motors have an internal regulator built into the alternator, on diesels it is directly below the pass. side wiper arm pivot point. Not sure what you mean for asd, but there is an under hood fuse box by the firewall with your relays in it. Hope this helps.

Mar 01, 2011 | 1990 Dodge Ram

2 Answers

I have a 1990 f150 lariat my alternator wont keep my truck running I replaced the alternator today along with alternator harness. I got the alternator tested and its good, the battery is good, and soliniod...


https://s11.postimg.org/crrcun103/generator.jpg

Click on the link.
The diagram shows generator with internal voltage regulator and with external voltage regulator, at the moment, I don't know which one you have?
The bat terminal at the generator should be hot even with the key off, is it, use a test light. If no voltage either the fusible link is faulty or the wiring circuit to battery +. You can see fusible links in diagram.
Could be other issues, the generator probably needs excite voltage or it won't work. The excite voltage comes from charge indicator circuit. Does the charge lamp on the dash work?

Jun 29, 2017 | 1990 Ford F150

1 Answer

Have a '91 Dodge Dakota with a charging problem - Diagnostic error code is 41 - Alternator checks OK - Engine Control Module box has been replaced - Battery has been replaced - Replaced wire going from...


If your alternator tests good off of the vehicle, but will not charge on the truck you need to make sure that the supply wire has 12V and that the field is also getting 12V. If you track it down to the ECU you can save yourself a bunch of money by having an external voltage regulator wired in and bypass the internal ECU regulator.

Jan 05, 2018 | 1990 Dodge D150

1 Answer

1977 dodge warlock will not charge. how do i check amp meter? i am getting power truck cranks but will not charge. i ve changed the vr had alt checked, checked and replaced wires to amp meter from fuse...


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?

Mar 01, 2018 | Dodge Pickup Cars & Trucks

2 Answers

Battery is fully charged, however there is no power to ignition, interior light, radio, horn ect. Is this the voltage regulator?


check the terminals that go to the battery,make sure the ground to the frame and engine is good and that the main 100 amp fuse is not blown in the fuse box,which is on the drivers side near the front.

Oct 23, 2009 | 1996 Dodge Caravan

2 Answers

TRUCK NOT CHARGING


check all the fusible link wires on battery(s) and leading to fuse panel!!

Jun 19, 2009 | 1992 Dodge Ram 250

1 Answer

1990 Nissan Pulsar charging problem


The alternator it self is bad internal not the regulator!

Mar 14, 2009 | 1990 Nissan Pulsar

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