Question about 1992 Dodge Ram 250

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TRUCK NOT CHARGING

92 DODGE D250 DIESEL NO POWER AT ALT FIELD WIRES , RELAYS ARE GOOD , NEW ECM DOSNT HAVE VOLTAGE REG , PART OF ECM

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Regulator on alternator is bad

Posted on Jun 19, 2009

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

Posted on Jun 19, 2009

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2 Answers

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

2 Answers

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


Voltage regulator is internal to the Alternator. You have to replace the Alternator.

Aug 13, 2014 | 1998 Dodge Ram 1500 4WD

1 Answer

Charging system voltage low


there are only 3 parts. but the causes are 25 or more.
1: belt missing slipping,
2: engine rpm below 800 RPM (lots of ways ,ask )
3: ALT had.
4: wiring to ALT bad.
5: bad battery or its connections, (wires)
6: bad fuse. see fuse link a11? on fFM page 20?
7: car is PCM alt controlled, it can be bad too. see 2 field wires on ALT and PCM on page 20? below?
8: battery temp sensor bad. making PCM think battery overheats.
the fSM covers all tests above.

pick car here, then pick charging.
5 alternators used on the 5 diffr.engines. got the wrong one?

the see wiring diagrams at end and chapter 20 inside, charge.
pdf page 118 for gas engine, if diesel next few.

Jan 07, 2014 | 1998 Jeep Cherokee

1 Answer

Loss of power


stock car YJ ? , or all hacked up. (old cars get hacked)
2.5 or 4.0 liter engine? still have a real jeep alternator not upgraded?

loss of electrical power (first rule, we never need to guess.!!!)
not with a voltmeter. (tool that costs $20 )
alternator good (by what means, autozoned?) ( we can find out one car)
but low on gauge. what gauge in dash voltmeter.? sure...
i think you car has no charge lamp only the dash VM.

own an volt meter? a DMM? hand volt meter?

1: if the alternator charge lamp is stuck on driving.
2: is battery voltage at 13.3 to 15vdc with engine at 800 RPM idling
alternator belt not slipping, for sure.....???
if the battery voltage is near 12.5v and falling running that is
an Alternator system failure, note i said, system. !!!

this is first. if we get to here. we can find the real cause.
test 3:
is the charge lamp on keyon, and goes out running?
make sure the big fuse for the alternator in the engine bay fuse
box is not blown, 50amp?

I have no 95 FSM and my online source sucks for 95

Alternator dead: (alt good)
1: belt slipping . engine at 300rpm, nah.
2: fuse blown, the big one. (engine bay fuse box)
3: ;wrong alternator, there are many, most others will fail, even good ones.......
4: alternator ground bad. (end to end, to battery minus)
5: bad wiring to same. bad connections, any to battery or alt.
6: some jeeps the PCM has the field regulator, see link below.
ECU pin 20 , is field pin, it is on 95, 4.0L (engine not stated)

is the CEL lamp on, and throwing code 41 DTC?, alt, field errors?

the alt has 4 pins, battery, field,ground and voltage sense.
The reg is in the PCM. and if bad is a bad $3 transistor..
see same form for fix for that issue..

i think this is same as your. 1996 is big change year.
http://www.jeepforum.com/forum/f12/1993-wrangler-pcm-ecu-ecm-pin-out-diagram-1170004/


you can test the alt, PCM wire pulled !, by full fielding the alt.
grounding the field term, no wires on field pin of alt.
see FSM for details on that.
The PCM modulates the field pin to control charge at all times.

Dec 17, 2013 | 1995 Jeep Wrangler

3 Answers

98 dodge ram wont start but cranks fine


I havr a dodge ram 99 gas start good run good the problem is when i stay in a light w s itin the truck turn off only in gear

Mar 09, 2013 | 1998 Dodge Ram

1 Answer

I have a 2000 ram 2500 with diesel. The alternator does not have any voltage on the blue wire for postitive excitation. The green wire (negative) will read to battery + so it is okay. I have done a...


The green wire should be your gen field wire not a ground wire. The alternator should be grounded through the alternator. The blue wire should be a feedback to the pcm only when the alternator is charging (engine running). Make sure your main 140amp charging fuse is good. It also has a battery temperature sensor that controls the field to the alternator. Wire 15 on ecm pnk/yellow to wire 4 blk/lt blue (c1 connector). This should be a variable resistor. If you have voltage on the Dk green wire when running but no output, suspect a bad alternator or bad connections going into the alternator. Be cure to test for alternator output on the alternator itself.

Oct 14, 2012 | Dodge Cars & Trucks

1 Answer

Do wires go from alt to reg


Can't remember if 1984 had a separate regulator. If the engine has a computer that's where the regulator willl be. If you do have a separate regulator it will have 2 wires. The green wire goes to the alternator field circuit. The other field circuit wire gets ignition on voltage as does the center terminal on the regulator, either a red or blue wire, probably blue.

Mar 06, 2011 | 1984 Dodge Ramcharger

1 Answer

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...


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.

Jul 06, 2010 | 1990 Dodge Ram

1 Answer

Charging system


If you have changed the alternator and regulator, about all that could be left would either be a short circuit that is draining current away, or a bad ignition warning light bulb. That is because the power to energize the field of the alternator, comes through this dash bulb.

Jul 18, 2009 | 1984 Ford F 350

1 Answer

Ive got a 1974 dodge pickup with a mid 80's? 315 engine. My alternator has a bat, field and grd terms. My wiring calls for 2 field terms? How do I marry them? The alternator is putting out big time and at...


you need to find the volt. reg. and the wires from the reg. go to the alt. the field doesn't get strait bat volt. but 13 or 14 volt isn't bad, but if your wires are rite than your reg. is bad. 18 volt is to high!!!

Jul 25, 2008 | Dodge D150 Cars & Trucks

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