Question about 1992 Volvo 740

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New alternator and battery drive 10 miles wont start battery dead

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CAUTION: NEVER DISCONNECT THE BATTERY TERMINALS WITH THE ENGINE RUNNING. This will instantly destroy the 6-way rectifier/voltage regulator.

Check that the Generator Failure light comes on and stays on with key on and engine off. N.G., verify your connections on the back of the generator. This circuit must function or the generator will never charge the battery. If this indicator circuit is miswired (the small spade connector is disconnected, plugged into the wrong connection or otherwise nerfed) the voltage regulator open-circuits the field (rotor) windings and in turn, the generator will never charge and freewheel. Check the circuit from the connector on the back of the generator all the way to the dash, verifying the light bulb in the dash is good. My trick is to wire in a small 3 watt bulb (or a continuity light) in series with the circuit under the hood. Turn the key on to KP II and verify it lights up.

Others: Check ground from generator to engine. This is usually a large blue cable that ties off onto a bracket near the air valve. Check ground from engine to body. Check ground from battery to body to engine. Must read less than 1 ohm on your megger.

Posted on Oct 22, 2013

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WHAT COULD THE PROBLEM BE?


Check all battery cable connections, including where (negative) attached to frame or engine block. Won't hurt to check wire connector to alternator as well and use voltmeter to check charging system out-put.

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Check and make sure your termimals to the battery are clean and tight. You can find out if the alternator is charging by simply starting the car and while it is running take the negitive cable off the battery. If the car quits its not charging (have the alternator check) if the car keeps running it is working properly. If it is charging and all your termimals are tight and clean you may have shorted out the battery and ruined it by hooking it up backwards. Good luck

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if your battery died while driving and the car cut off while your driving,, your problem is from your alternator!!!,, on a normal working car, you can start, remove ther battery terminals and the car would still run cause the alternator will be powering the car. In your case the alternator isnt working and the car was working on battery power therefore when the battery went dead the car cut off.. Your alternator need \s to be charging between 13.5 and 14.2 volts.. as little as 10 volts will keep the vehicle running.. I'd suggest you have the alternator replaced.

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Put a new battery and go through an electrician to see if the alternator is charging the battery

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Take the car to Sears or another large auto parts store and have them check the condition of the battery and alt. They do the check for free!
Watch what they do and have them explain.

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94 pathfinder wont start seems like dead battery but is charged t


If you have had the battery checked, attempted to jump start or know for a fact that the battery is new and/or should not be dead....you may want to have your alternator checked out - it may need replaced. When alternators go bad they mimic the effects of a dead battery (tries to turn over, battery light comes on, etc.) Hope that helps - you can pick one up and install yourself for around $150 bucks or 400-500 to have someone else do it for you.

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