Question about 1990 Volkswagen Passat

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Wiring an amp meter diagram

IQuestion: How do I connect up (WIRE) an amp meter? To
a 12 volts DC, 55amp hour Alternator? I wish to monitor the Alternators output.

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Put the meter in series remove wire gointo back of alternator put one lead on wire and one on alternator that should give you your reading

Posted on Jul 23, 2009

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Posted on Jan 02, 2017

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How can i hook up a car stereo in the garage without using a car battery, and get the same juice as far as wattage and power???


Wire a 12 volt AC adapter to it. Connect the power to the positive wire, & the ground to the negative wire. If it's a low power unit a 1 amp adapter will work. If it's a high powered unit you might need a 12 volt 5-10 amp adapter designed for monitors, TVs, monitors, & some laptops. Beware some laptop AC adapters can be 16-36 volts. Make sure you use a 12 volt one, & know which wire is positive, or you'll burn it out.

Jul 08, 2015 | Cars & Trucks

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How to test an alternator


Diagnosing alternators are about the same on all vehicles. You will need a digital multimeter to do the tests. ( WalMart has cheap ones for around $9) <br />First, you need to make sure it isn't really a battery problem.<br />One at a time, take off each battery cable at the battery and thoroughly clean the terminals and cable ends and retighten securly. NOTE: take off negative (black) first, leave it off, then do the positive (red) cable. Re-attach positive and then negative last. This way you will avoid any contact spark on the positive side which could damage your computer or wiring.<br />Next, check the voltage on your battery. With multimeter on Volts DC 20 setting, you should get around 12.65 Volts DC. <br />NOTE: Always use red lead on meter to positive (red) cable / battery post and black lead to negative (black) cable.<br />If your battery was discharged some due to your alternator suspition, you can go to the next step and start / jump start the engine.<br />With engine running test voltage at the battery again. You should get 13.4 to 14.2 volts.<br />Wiggle your test leads, scratching at the metal battery / cable terminals to ensure a good metal contact.<br />If you get more than 14.2 volts DC, your voltage regulator in the alternator is bad and the alternator must be replaced.<br />If you get less than 13 volts DC, move your black test lead to an engine ground (metal bolt which holds the alternator on, or clean metal surface / bolt on engine itself) and see if your readings are the same. If you get a higher reading of 13.4 - 14.2 volts your negative connection (cable or attatch point on engine) is faulty.<br />If still the same (less than 13 Volts) Move your red test lead to the connection on the back of the alternator itself where the red wire connects and black lead to ground. If your voltage is higher in the 13.2-14 volt range, your positive (red) cable or connection in that circut is faulty.<br />If none of these test produces at least 13.2 volts DC, replace the alternator.<br />If you get good alternator output voltages, but your battery won't hold a charge, have your battery load tested (free at auto stores or WalMart) as it is probably bad.<br />Hope that helps!<br />Mike

on Jul 13, 2011 | GMC Jimmy Cars & Trucks

1 Answer

I have a draw on the battery on my 85 Toyota pickup it kills a fully charged battery in about 2 hours... Ive put a volt tester between the disconnected positive battery cable and the positive battery post...


Go to You Tube Video & see how to do a parasitic CURRENT
drain test

What you have done so far with a test light & volt meter is basically
doing nothing

You need an amp meter & a wiring diagram,then pull fuses one
at a time, to get to the circuit that causes the drain,then use the
prints to test that circuit for voltage drops

Mar 15, 2014 | 1985 Toyota Pickup

1 Answer

No power to alternator


power to alternator goes direct from battery (usually through fuse able link) trace that power wire from back of alternator to the battery see at what point the power is on that is the place to look for

to that have DVOM at dc volt,put the black lid at battery ground and the red one ,on wire from back of alternator,keep following to the battery,till you see 12 volt on your volt meter,

Apr 18, 2013 | 2001 Chevrolet Impala

1 Answer

How do you check if alternater is not charging...


put a volt ohm meter red wire to wire on alternator and black to the closest ground (anything metal) set it to dc current it should read between 12 and 13 volts as you increase the rpm so should the voltage if all is good be sure the wires are in good condition (no breaks or corrosion) it can also be checked to see if it is supplying the rite amount of amps but this requires a more expensive vohm meter

Oct 16, 2012 | BMW 318i Cars & Trucks

1 Answer

Starts with a jump but cuts off soon as cables are disconnected


Check your batteries voltage you need at least 12 volts.If you don't have 12 volts then put the battery on a 2-4 amp charge for 6-8 hours.Then if the battery does'nt have 12 volts get a new battery.If your battery has 12 volts afterwards and still cuts off then your alternator is faulty.With the engine running your alternators power wire should show 13-15 volts coming out.

Feb 03, 2012 | 2004 GMC Sonoma

1 Answer

Major electrical issue. Always a draw on the battery ... Went through 12 batteries and finally put a dump truck battery in it. Replaced the alternator as well. Now the car will not start at all. Three...


Hello. Install amp meter on the battery main feed. One the amp meter is coupled by direct or induced coupling. Start remove the fuses and watch the amp meter and when the amp meter indicator drops that one of the circuit that have some shorted or running. Now they can be more than one circuit that is operating when it shouldn't.

First thing with the amp meter connect disconnect the alternator. Do get wrong here. It a percaution if you happen to concur a large short. Also, when disconnecting the alternator look at the amp meter to see if there is a drop in current being used.

An alternator is a three phase AC generator. There are 6 to 8 high current diodes hook up where it turn the three phase AC voltage to DC voltage half wave + side of the AC. Then this DC voltage being combined voltages goes to a regulator which smooth out the voltage to 13.8 volts approx. The 13.8 DC voltage is need to recharge the battery. Because the vehicle operates on 12 voltage system it uses the battery for the constant voltages of 12 volts and a story house of current. stewbison

Aug 20, 2011 | 2004 Chrysler Pacifica

1 Answer

Okay my boyfriend has a 1999 dodge intrepid with 172,000 miles on it. he bought a new battery but now the battery light is still on? do you know what the problem could be? also what could he do to get it...


if the battery light is on while running the charging system is not working.you can check
with a volt meter,setting meter to dc volts & connect meter leads to battery.reading should
be 13.2 - 14.5 volts if lower than this your only reading battery voltage.check single red wire to the alternator it should read battery volts 12v.if battery voltage is present than alternator is faulty,if no voltage reading you'll need to trace & repair the wiring
note; battery should be fully charge before testing

good luck

Jun 20, 2011 | 1999 Dodge Intrepid

1 Answer

My mom has the same problem w battery w. chrysler 300m(2002) she allready replace w. new battey then chrysler service dept. told her the battery was fine n replace her starter now electric shop says it is...


Sounds like alternator if the battery is not staying charged or the output from alternator the big red wire is lost connection to battery +.
a voltmeter you can check with across battery and it should show minimum 13.8 volts minimum to be charging.
if the battery is low it should show 14.7 volts if it shows 12 volts or less with lights heater etc running then alternator is not charging.
You can get a cheap volt ohm meter from radio shack or walmart and use the DC setting 20 volt scale on meter and start the car and turn on everything and put the test leads of meter across battery terminals and see what the voltmeter says.

May 18, 2011 | Chrysler 300M Cars & Trucks

1 Answer

I always have to jump my car and it always have to be put in park or neutral when i stop at light


First clean the battery connections, charge the battery then have it tested at Auto zone or another parts store they usually do it for free if it's a bad battery replace, if not check the output of the alternator while the car is running. locate the alternator then locate the large wire comming out of the back it is usually red pull aside the rubber boot that covers the ring connector in order to touch the probe of a voltmeter to it, set the volt meter to 12 volts dc with the car running ground the black probe while touching the red probe to the output wire at alternator it should read 13 volt or higher but no higher than 14.5 if not replace the alternator.

Oct 29, 2010 | 1998 Mercury Grand Marquis

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