Question about 1993 GMC Sierra K1500

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I am positive of my tester further more if I check at the battery i get a flat 12v just on the alternator output i have 24v also the exciter wire should it have power after engine start

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A full charged battery will read 12.6 or bit more depending. When the car is running, the battery should read 13.6 to anywhere between 14.6 anything over 15 or 16 is not good!!!
hope this helps, your problem is not to clear

Posted on Jul 03, 2009

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How do you wire up 4 6 volt batteries in a 1976 kenworth. 12 volt lights 24 volt starter


When you go pos to neg from one battery to the next it increases voltage, pos to pos just increases amperage. You would want to wire 2 in series, just imagine stacking batteries in a flash light, pos from one to neg on next. Remaining pos and neg are 12v now. Run both remaining pos to starter and ground both negs. your pushing a lot of amps with the batteries and doing 12v, and your charging system is 12v. If you do another series from there, you have to regulate the voltage when the starter kicks in...you risk burning every light and electric component...just like running 12v in 6v system... You can also use 4 12v batteries and run all pos to pos and all neg to neg and have mega cranking amps...that is how all modern big trucks are set up. Your pushing around 7k cranking amps that way(1500 per battery)...plenty to start the healthiest cat... And don't have the worry of dual voltages or running in series. You really don't need 24v to start and unless you have a 24v alternator, these are your 2 options. Best bet if your not sure is to try with 12v...no risk of frying anything even on 24v system. 24v on 12v system is, on the other hand, a big risk. 43bf17ec-4e37-4a15-a147-d1e7a1377d9f.jpg

Jun 03, 2014 | Cars & Trucks

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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

Put in a new atl wont charge


If both the alternator and the battery are good, either the alternator isn't turning fast enough (slipping belt or engine idle speed too slow), or you have a wiring problem.

To check your wiring, look for the "1" terminal on the back of the alternator (left side of spade terminal connector). When you turn the ignition key to the run position without starting the engine, the alternator warning light should be at full brightness. If the bulb is burned out, the alternator will not get the excitation current it needs to start up (it goes through the bulb). With the engine running, you should measure 12 Volts at the 1 terminal (this is the excitation terminal).

Another thing to check is whether the battery charge wire is good. If it is corroded inside at the battery clamp end or burned out, you won't get charging even though the alternator appears to be working. If you don't have an ohmmeter, you can make a quick test by adding a new 8 AWG wire between the output terminal and the battery clamp. If the battery now charges, the original wire is bad. If this works, I recommend installing an inline fuse at the alternator end no larger than the largest size used in your electrical system, just in case something happens to the jumper wire. That way you won't burn out your alternator.

The heater/AC issue could very likely be a separate problem, but inadequate power may keep that system from running properly. (Note: low idle speed or belt problems will also be detrimental to AC performance.)

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1 Answer

04 crown vic alt no charge


Well, either you have a bad alternator or a broken wire at the alternator. Check the small red field wire which excites the alternator and the large red output wire. Also check for a loose belt. Make sure your battery is charged as trying to charge a dead battery can overload and destroy an alternator.

Dec 11, 2010 | 2004 Ford Crown Victoria

3 Answers

Battery not charging


Alternators don't have magnets. It's not like a DC motor where you can just turn it to produce electricity. Alternators need 12v power from the "exciter wire". This is usually a small wire that accompanies the large wire on the alternator. Modern cars may have more than two wires, but the idea is the same. Anyway, the exciter wire energizes the magnetic field when you turn the key on. Without this electro-magnetic field, the alternator will never produce power. First, check all your connections to ensure that no corrosion or breaks exist. Then check your fuses. The exciter wire circuit is probably fused. On some german cars, the exciter wire circuit goes directly through the instrument cluster. If you feel like getting your hands dirty, purchase a voltage meter or a test light. Turn the key on and test the smaller wires on the alternator harness. One of those will be the exciter wire and should see +12V when the key is turned on. If you see no voltage at one of those small wires when the key is turned on, there's your problem. Due to the nature of this problem, it really is tough to say where to start looking for the break or which wire to test with your test light. You may have to involve a professional mechanic. Good luck.

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1 Answer

I have a 3 wire alternator i need to wire


Assuming you have an external voltage regulator:-

The largest stud/nut terminal is B+,
this is the charge current output, it connects to battery positive (uses heavy high current capacity cable),

the other terminals are normally spade terminals :-
DF exciter winding control, (controlled by ext voltage regulator);

IND (or D+) - via dashboard 'BAT' indicator light, then to +12V when Ignition switch is 'ON' (alternator excitation current source).


If you have an alternator with an integral internal voltage regulator,
only B+ (sometimes with an additional B+ terminal)
and IND (or D+) terminals are present.

Jun 21, 2009 | 1985 Chevrolet Sportvan G10

1 Answer

Battery not charging new alt new volt. reg.wtf?


Ensure alternator excitation lamp (IGN) indicator lights when Ignition vehicle ignition is switched on prior to starting engine.
This light should normally extinguish as soon as motor starts.
(+12V is supplied through a small lamp to the Alternator 'IND' terminal whenever the Ignition switch is on).
Also check for any burnt out fusible link on the alternator output- terminal B+ should have battery voltage on it at all times.

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1 Answer

Eating alternators mitsubishi shogun 1994 2.5td gls


is your a 12v or 24v some imports are 24v and engine parts are different thanks brian

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1 Answer

Alternator


Yes it is the wire that comes from the alternator/battery lite in the dash.

Oct 29, 2008 | 1994 Chevrolet C/K 3500

1 Answer

Alternator not exciting


Hi ' If you changed the battery and alternator,
Check the voltage at the red wire on the alternator. if there a less than 12 volt.
Check the fuse link, that goes in the starter positive bolt.
If the fuse is bad replace and recheck the charging system.
IF charging normal. good.
If not, che the fuse in the fuse box, "" cluster".
If the fuse is blow out, replace. and check again.

OK. I hope this work for you.

Jul 06, 2008 | 2000 Chevrolet Astro

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