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Same car with heater motor issue-when the battery is unhooked while the car is running it dies-alternator output tested at 100 amps - is this related to the blower wiring issue?

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Since you want to DIY, I recommend a repair manual from your favorite Auto parts store, or try if they have it, or You will want it next time anyway.

Posted on Apr 07, 2015


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Wasn't charging. changed battery and alternator. by the gauge it shows 14 volts but with the truck running and i unhook the battery it dies.

Not on new vehicles , you never ever pull a battery cable while it is running ! A voltage spike can take out electronic components ! That was 60's an maybe a few 70's vehicles ! That change when they started using transistors in voltage regulators an in engine modules. If it is show 14 volts it's charging ! I will send a link on how you test the charging system. How To Check Charging System EricTheCarGuy

Feb 20, 2015 | 1996 GMC Sierra

1 Answer

New batterey an new alternator still dies when i unhook pos cable

Where both rebuilt alternators any good
& retested at store?

Your explaining a constant voltage drop,
once the battery is hooked up.

How about the ignition switch?
Does that have anything to do with
the regulator control in alternator?

You haven't said you have 14 plus volts
with motor running,so basically you don't
have an alternator charging your new battery
& the ignition currant, even without the lights on,
is running down the battery

All I said is what you already know

I'm is missing something?

Don't unhook any battery cables with
the motor running,were not living in the 1960's

Those type tests will ruin many things on newer
vehicles, than yours,loose that practice & also avoid
jump starting any vehicle from 1996 on

Mar 29, 2013 | 1988 Chevrolet C1500

2 Answers

Car battery is loseing its charge when left for 48 hours. Alternator chargeing ok at 13.6 amps. No battrey drain indicated when checked with a DMM . Does this indicate alternator diode problem ?

You shouldn't check the amps - they vary according to the status of the battery, you should check the voltage and 13.6 V is way too low - the battery is practically never charged and this is why it fails just by sitting.
Check the alternator and replace it if in doubt.

Jun 15, 2010 | 2001 Ford Focus

1 Answer

'06 Sedona battery light comes on. Low voltage indicated on radar detector. Battery was replaced ...2 days later the same problem. When battery was replaced, I unhooked batt connectors and van still...

It can still be the alternator, the alternator can produce enough to keep the car running, but it may not have enough to keep the battery charged 13-14 volts. It don't take long for a new battery to drain if the alternator isn't putting out the right voltage. Find a voltmeter and check the output from the alternator to see what voltage is being produced. If it's not at least 12.5 -14 then have the alternator checked out.

May 16, 2010 | 2006 Kia Sedona

2 Answers

How do I troubleshoot the charging system?

test battery and alternator battery may be loosing charge or alternator output enough to run vehicle but not enough to keep battery charged some auto stores such as auto zone/advanced auto can bench test both for free

Oct 30, 2009 | 1991 Toyota Corolla

2 Answers

The alternator is still good but everytime i jump start the car it makes it half a block and dies.

Your alternator is charging however it is not still good if it does what you are stating. Also what is the condition of your battery if you have to keep jumping your car? Car batteries don't like to be completely discharge and may not hold there charge again once run dead and may need replaced... Alternator has to have be bad as it needs to be load tested to best determine it's true output. Most auto parts stores do a run test and no load test. Load test will tell amperage rate and true quality of an alternator.

Aug 28, 2009 | 1993 Mitsubishi Mirage

1 Answer

Electrical issues (2 or 3) with Mazda Tribute 2002

hello there, there is a way to check if the alternator works, just start the engine and run it at idle for a minute or so just to get the engine warmed up. while the engine is running, try to remove the positive terminal cable from the battery (note: no lights, radio, or any accessories operating). the alternator should be sufficiently providing power to the engine. if it dies down the charging might be weak. another way is purchase a digital multimeter and setting it to dc voltage testing. put the tester prongs on the correct terminal( positive to red positive and negative to black negative) test the voltage prior to starting. usually it shall read 12. 3 or a tad higher. remove the tester prongs from the battery terminal and start the engine. then place it back on. the reading shall read 14V plus without any load. sometimes it might read 15V w/c is usually over for certain cars. then turn on all accessories: headlights, aircondition/heater and etc. if the reading on the tester indicates 12.8V and above 13V your charging system is ok.(all this test is on engine idle)

For the battery, my experience is that 2 years of battery duty is quite good already. unfortunately, during these span of duty the battery might give a 12V reading but its strength is not enough to sustain the load. the voltage of the battery is the physical attribute so to speak and ampere is the power or strength of the battery.

for your accessories that died, I think something tripped when you jump started it. but the accessories are easily traceble. I think what's important is keeping the engine in tip top condition and won't let you down during hard times.

hope some of this helps you.

May 04, 2009 | 2002 Mazda Tribute

1 Answer

Car won`t start sometimes. battery is good, starter is also good.

simple test after you start it.. unhook the battery. if it keeps running it is the battery.... if the motor dies it's the alternator


Sep 09, 2008 | 1997 Mitsubishi Galant

1 Answer

Chrging system error

simple test after you start it.. unhook the battery. if it keeps running it is the battery.... if the motor dies it's the alternator.


Sep 09, 2008 | 2003 Lincoln Navigator

2 Answers

95 pathfinder wont stay running and doesnt charge

Check all grounds running from all electrical, If there is not a good contact this problem will occur, when you locate the ground surface take sandpaper or even a knife and scrape or sand the connector and the ground surface then reconnect it, It should return to normal if not then it could be a solenoid possibly but not sure

Sep 07, 2008 | 1995 Nissan Pathfinder

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