charging circuit woos
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Senior User
Joined: Jun 2004
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From: lancaster ohio
charging circuit woos
i got her to start and run good but there is still something getting the best of me. with the truck running if i pull the battery cables the truck dies. new alternator and belt is tight. had it checked and it is good. previous owner put on new voltage reg. alternator connections are good and tight. no visible wire damages. no smoke im just stumped its probally something stupid and im just missin it. any help?
Cargo Master
Joined: Sep 2005
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short the "+" wire to the FIELD wire on the regulator, that will make the alternator charge full. if it does the regulator is either bad or has a bad ground. If it doesn't check to make sure both those wires have continuity to the alternator if they do the alternator is NG.
Posting Legend
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Do NOT pull the battery cables with the engine running! If your alternator is operating this will cause what is known as a "load dump" transient which can impose a high power and high voltage (400V) spike on your electrical system that will wipe out many components.
I'll have the Roast Duck
Joined: Jul 2002
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From: Northshore, MN
automotive multimeters, should allow you to check the battery, alternator, etc... without having to risk injury by pulling on cables. On another thought, your solenoid post where the positive battery cable goes to might be broken or loose.
Cargo Master
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Originally Posted by Torque1st
Do NOT pull the battery cables with the engine running! If your alternator is operating this will cause what is known as a "load dump" transient which can impose a high power and high voltage (400V) spike on your electrical system that will wipe out many components.
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New User
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[size=3]I announce the same warning when I see people who say they do this.
It's the Fastest way to screw your charging system.
This BAD practise is From the old days of GENERATORS , that sometimes needed a electrical spike/spark to get them to start producing power.
Errant Content edited out
It's the Fastest way to screw your charging system.
This BAD practise is From the old days of GENERATORS , that sometimes needed a electrical spike/spark to get them to start producing power.
Errant Content edited out
Last edited by Mil1ion; Dec 29, 2005 at 07:24 PM.
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From: Durham, NC
Specifically, an alternator puts out pulsating DC current, not AC. But, the previous posts are correct, NEVER EVER pull the battery cables loose when the engine is running. Voltage spikes in excess of 400V can be produced due
to the Di/Dt (change in current / change in time) * the wiring inductance.
As previously mentioned, the alternator puts out pulsating DC, and this pulsating DC is filtered to pure DC by the battery. The battery is a HUGE capacitor, that opposes change in voltage.
to the Di/Dt (change in current / change in time) * the wiring inductance.
As previously mentioned, the alternator puts out pulsating DC, and this pulsating DC is filtered to pure DC by the battery. The battery is a HUGE capacitor, that opposes change in voltage.
Cargo Master
Joined: Sep 2005
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Originally Posted by Mil1ion
I announce the same warning when I see people who say they do this.
It's the Fastest way to screw your charging system.
This BAD practise is From the old days of GENERATORS , that sometimes needed a electrical spike/spark to get them to start producing power.
This is NOT for alternator systems as they are A/C current not DC like Generators are.
It's the Fastest way to screw your charging system.
This BAD practise is From the old days of GENERATORS , that sometimes needed a electrical spike/spark to get them to start producing power.
This is NOT for alternator systems as they are A/C current not DC like Generators are.
Cargo Master
Joined: Sep 2005
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Originally Posted by Bob Ayers
Specifically, an alternator puts out pulsating DC current, not AC. But, the previous posts are correct, NEVER EVER pull the battery cables loose when the engine is running. Voltage spikes in excess of 400V can be produced due
to the Di/Dt (change in current / change in time) * the wiring inductance.
As previously mentioned, the alternator puts out pulsating DC, and this pulsating DC is filtered to pure DC by the battery. The battery is a HUGE capacitor, that opposes change in voltage.
to the Di/Dt (change in current / change in time) * the wiring inductance.
As previously mentioned, the alternator puts out pulsating DC, and this pulsating DC is filtered to pure DC by the battery. The battery is a HUGE capacitor, that opposes change in voltage.
New User
Joined: Jan 2008
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To add further confusion to this topic,some repair sites state that we are not supposed to call alternators built after 1986 ...alternators...we are supposed to call them generators.
Eric, Go to google and type in . Disconnecting battery cables with engine running............. and read the first 10 hits
Eric, Go to google and type in . Disconnecting battery cables with engine running............. and read the first 10 hits
New User
Joined: Jan 2008
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http://www.google.ca/search?hl=en&q=...e+Search&meta=
Top of the page
http://www.bentleypublishers.com/tec...s.cautions.htm
http://www.batterystuff.com/tutorial_battery.html
http://www.repairfaq.org/ELE/F_Car_B...CARBATTERY_031
http://www.ehow.com/how_112584_troub...-car-wont.html
http://www.2carpros.com/topics/battery.htm
http://www.asashop.org/autoinc/april2005/collision.cfm
Top of the page
http://www.bentleypublishers.com/tec...s.cautions.htm
http://www.batterystuff.com/tutorial_battery.html
http://www.repairfaq.org/ELE/F_Car_B...CARBATTERY_031
http://www.ehow.com/how_112584_troub...-car-wont.html
http://www.2carpros.com/topics/battery.htm
http://www.asashop.org/autoinc/april2005/collision.cfm
Last edited by Mil1ion; Dec 29, 2005 at 07:37 PM.
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From: Louisville,Ky.
I have seen bulbs explode and such from these voltage spikes!! Not to mention, the spark produced when connecting and disconnecting the cable can ignite the gasses produced by a strained battery!!