Question about Chevrolet 1500

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2 wire alt has batt voltage no voltage on the exciter wire where does that come from ? does it charge through the dash guage?

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  • Chevrolet Master
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The evciter wire is fed by the ignition sometimes through a resistor wire. The charging cicuit does not go through the dash.

Posted on Apr 09, 2011

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2 Answers

Put a new alternator and battery on the truck but still does not charge


Hi George,
I need year--make--model--engine size.
Usually the alternator needs excite voltage or no charge. The alternator bat terminal should be hot all the time, even with key off, if it isn't, something wrong with that wire circuit.

Mar 04, 2016 | Cars & Trucks

1 Answer

98 chevy malibu my alt isnt charging new alt batt test good cut out the fuselink on starter the alt wire runs thru firewall If i run a wire straight to the batt it is putting out 19v any suggestions


Did you check the fuse in the under hood fuse box ? GEN / BATT fuse 10amp . Is your check engine light on ? This is a computer controlled charging system , it should have four wires connected to the alternator . 1 - the heavier wire on the back ,this comes fro the starter - the one with fusible link , you could have checked for battery voltage with voltmeter ! The three other wires in the connector are the orange one ,this comes from the GEN / BATT fuse an should have battery voltage ! The last two come from the PCM - engine computer . The gray wire is the turn on signal from the PCM an the Red wire is the control from PCM ! Charging System Wiring Diagram MOTOR Magazine Article MOTOR Information Systems

Aug 14, 2015 | Cars & Trucks

1 Answer

Battery light alternator


The Charge lamp comes on with the Alternator fails to keep battery charge going. (lots of way to fail, and ALT Is 100% good) it's a system. each part of it must be good, end to end.
so...
i put my voltmeter across battery, i start car, i see 13.3 to 15vdc, alt is good.
no? , i see now, 12.2v. ALt is dead, (i didnt say bad) and battery is sightly discharged, 12.6v is charged. (key off, rested voltage)
This 12v tells me the ALT is shut down. only why is the question.

how can any charge system fail,
bad battery tops the list here, they LOVE to fail.
1: belt slips.
2: belt missing
3: bad alt.
4: bad wires to ALT . (corrosion on any wire or lug)
5: fuses blown , any listed below.:
your alt is not an ECU controlled, alt ,its 100% self contained

did you ever remove the ALT and blow the 100 amp fuseable link
the first step of any alt pul, is the pull the NEG, battery lug or BOOM.

im logged in to alldata.com so can you.

and what do i see.
a 5 wire ALT. one is the frame ground, so it must not be rusty or..... it fails. frame to engine block. no rust here.

wire L , yellow.goes to dash LEDs (alt failure idiot lamps) (this works)
wire. S white goes to ALT 5a fuse, is it blown?
wire :B B/G color, goes to the 100 amp link fuse. (blown>?)
wire IG Red-white, goes to a fuse marked 10A gauge.

i think the IG wire is the voltage sense wire.
no sense, no charge. I think the whole I/P dash cluster goes dead when this fuse blows.

The S wire is the boot strap voltage sense, it wakes up the regulator .
if open , the reg stays asleep, as does ALT.
Alternators can not self start, the regulator has boot strap device
that cures that. called self excitation. so this wire is critical.
All wires except the L wire is critical. in this case.

the B wire is the big wire, it charges the battery . 50amps or more..

any of the 5 paths open , kills the ALT dead.
The REG inside the ALT can also shut it down.
eg: battery bad, with huge cell resistances. total.
eg: overvoltge for any reasons. including attempts top run car with no battery, (dont ask)
eg: over current (battery cells 1 to 6 shorted) or 25 KC lamps added.
eg: over temperature shut down.

that is about it.







Dec 31, 2013 | 2003 Toyota Matrix

2 Answers

2000 vw jetta alternator won't charge


the alternator gets power on big wire battery voltage the wire runs to starter, fuse box .alternator fuse goes to automatic shut down relay to relay control in ecm/pcm the field wire comes from ecm /pcm to alt.other field goes back to automatic shut down relay back to charge battery . if not charging at alt. try new alt. and retest.

Aug 05, 2012 | Cars & Trucks

1 Answer

1994 E150 van ford no alt power have changed the alt. charged the batt


There is a fuse or fuseable link between the alt and battery, and the alt gets a signal from the key to activate the voltage regulator.
I would check for batt voltage at the alternator and you may need a wiring diagram to check for key voltage.

Jul 02, 2012 | Ford Cars & Trucks

1 Answer

Alt has a small red wire in the plug. what is it for


The circuit it forms part of runs from the battery, throug hthe charge warning light on the dash, the the voltage regulator on the alternator. The wire does two jobs.

When the alternator is generating output, it fails to carry any current (sounds odd, but that's how it is) because there's a similar voltage at each end. As a result, the charge warning light on the dash goes out.

When the alternator is freshly spun up, current flows through this wire (sourced through the warning lamp) to provide the initial excitation for the alternator, allowing it to generate electricity. One the alternator is working, it uses its own power to create excitation.

A.

Apr 30, 2010 | 2000 Pontiac Grand Prix

1 Answer

Alternator f-150


replace the link between the alternator and the positive side of the battery. This is a fusable link and sometimes can cause this problem this would be the easy fix and is hard to test

May 17, 2009 | 2002 Ford F150 Regular Cab

1 Answer

No battery charge


if batt.gets drain while driving,charging system is not working!by comment,u knew that!u can check wiring connection at alt.for bad contact,corrosion or damage wiring,check for batt. voltage at big red wire at alt.,but these models are prone to alt. failure,if connections are ok,pull out alt. have it check at part store they do not charge for this,

Apr 27, 2009 | 2004 Kia Spectra

1 Answer

Alternator not charging


Check for voltage with a multi meter or volt guage most of the GM trigger wires come from the computer and are only 5 volts. 5 volts is not enough to light some test lights. If still nothing the problem is probably the computer. But it can be manually excited. The two terminals in the alternator on the left of the pigtail (when looking from the front of the van) need + power. the far left is the trigger wire the one next to it is ignition power.

Dec 13, 2008 | 2000 Chevrolet 3500

2 Answers

1988 chevy suburban charging system problem alternator wont charge new alternator new ignition switch good battery good belt removed old alarm system removed and replaced fusible links no shorts in system...


First check alt At The Back of Alt Big Red Wire Were hooks to Post (stud) Do you have voltage ?? How Much??
What Voltage do you have at same Place with Engine Running ??
Now At wires Were they plug into Alt ,Top. Wires in White Plastic Clip, Do You Have Powe With Key On ?? How Much Voltage??
Jump across the 2 in the clip (with Engine Running)ONLY TEMPORARY!! Do You Have Voltage at Battery ?? How Much??
If Over 13volts With Clip On (Jumped) You Need A Internal Voltage Regulator ..
Is Batt Light On on Dash ??? Theres A Lot Of Testing You Can Do !!! And I will Need More Infomation to Keep Going ... These are just some Possible Problems No Way In Depth ...
Could Be a Number of things Or May be Just as Simple As a Blown Fuse, Dirty Batt Cables ETC etc etc I Hope It Puts You On The Right track !!!!!!!!!!

Dec 02, 2008 | 1988 Chevrolet Suburban

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