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Automotive Repair Car Troubleshooting Topics   Car Troubleshooting   Engine Troubleshooting   Engine Fault Codes   Electrical and Wiring   Transmission Problems Car Repair Topics   Car Making Noises   Car Stereo Repair   Heating or AC Issues   Motorcycles and ATVs   Tricks of the Trade   Truck Repair Advice Site Options:      Login   Sign up here! Latest Forum Post   2006 Toyoto Camry XLE Driver Side Electric Window Trouble Hello, Looking for a little brain help ...   Tierod end change caused some kind of leak Hello so I just took my car to the nearb...   2011 Dodge Nitro OBD scanner seems to drain battery in 10-20 minutes When I bought this car in summer 2023, a... Grounding Cable, 2017 Jeep Renegade Trailhawk The Cable that connects my negative batt... Rough Idle (Found new thing) Hi everyone. First of all sorry for bad ...     equipment hey yall. im a first year engineering st...   HELP I have a 1956 1/2 ton panel truck, 69 35...   Howdy     Just wanted to s...   ABS/Tractiob/Brake Lights on But No DTCs Hello all, Recently while driving m...   Chevy strut replacement I'm trying to get a sensor of some kind ...

Search Auto Parts Search altenator check Sign up here!   Email This Post Auto Repair Home>> Automotive Repair>> Automotive Wiring and Electrical clt400 New User Feb 22, 2006, 8:07 PM Post #1 of 3 (1898 views) altenator check Sign In Can I check my altenator to see if it is working by disconnecting the battery while the car is running? Should the car stay running? (92 eagle talon) Tom Greenleaf Ultimate Carjunky / Moderator Feb 23, 2006, 1:25 AM Post #2 of 3 (1895 views) Re: altenator check Sign In Some may and some may not. Just put a voltmeter on it which should read 12V+ if off for a while and perhaps 14.5V with it running. That could vary a bit but not too much, should be more that 12V while running and you are probably OK. If your battery is older than 3-4 years I would suspect it if you have troubles. T DanD Veteran / Moderator Feb 23, 2006, 5:20 AM Post #3 of 3 (1891 views) Re: altenator check Sign In Just to back-up what Tom is telling you. Don’t ever purposely disconnect the battery while the engine is running, you maybe very sorry if you do. As in burning out electronic devices that do not like voltage spikes as you open and close the battery connection. Maybe back in the 50’s and 60’s it was a back-yarder’s way of checking the charging system but that was when they used generators or an alternator with an external mechanical voltage regulator. The only electronic device on the car was possibly a single transistor in the radio. Get a voltmeter take a battery voltage reading before you start the car; start the car and take another reading. You should see anywhere form a volt to three-volt increase at the battery almost immediately. If it stays the same or goes down in voltage the charging system is not working, it doesn’t tell you why just that it isn’t. Dan. Canadian "EH"   Email This Post   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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