Question about 1970 Oldsmobile 442

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Have 1971 442 got 12.5 volts on gagego to start and gage goes down to zero.put battery charger on for seconds gage goes to 14 car starts shut car off wont start again.tryed new starternew battery can you suggest anything

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Got family here and they are all talking at once and its putting me off a slight bit ,right try charging the battery for about 2/3 days and see what happens then get back via this reply ,as i need to know is it cranking or is is turning over but not starting.

Posted on Jul 17, 2010

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Posted on Jan 02, 2017

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Check the battery voltage. If it's less than 12.2 volts, you've either got a charging problem or something is draining the battery. Read this post on how to find a battery drain.
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Hooked up my new battery backwards, blew the main fuse. It has been replaced and now the meter fuse in the inside fuse box blows within seconds and gage cluster and alternator not working


Could have damaged regulator. When the car is running have you checked the voltage at battery terminals. If battery is charging it should be around 14 volts. If around 12 your charging system is fubar.

Meanwhile if you have to charge the car every day then something in the car is draining the battery, Using an ammeter you need to track it down, Hook it up to battery and pull fuse out one at a time till the drain goes down. That isolates the circuit with the problem.

Dec 03, 2015 | Cars & Trucks

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The volt gauge reads 14 volts when the truck is running (2004 Chevy 2500 HD, 6 Liter) after I shut it off Voltage gauge reads 9 volts as low as the gauge goes. The starter acts like it is not getting...


14 volts is close (14.5-14.8 volts is required
and 9 when shut down indicates a bad battery
have it load tested and then have the alternator tested for rectifier pack operation
there should be 14.5 volts DC at the battery when running or it is not charging the battery
if you have 14 volts AC replace the alternator with a serviceable unit

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I have a 2002 ford ranger that got a lot of water in the gas. I have drained the tank and added heat as well as replaced the filter. When I try to start it the battery gauge goes down to 0 and all I hear...


The alternator isn't charging , check B+ voltage hook-ups on the alternator . The heavy gage wire on the back of the alternator should have B+ voltage , vehicle not running . The fuel pump has nothing to do with it > terminal 3 at the connector should also have B+ voltage , So should terminal 1 . Charge the battery an get the vehicle running , put a volt meter on the battery post's , if there is about 13 to 14 volts running it is not charging !
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2002 mercury montaineer , battery light comes on , they gages shut down couple minutes after then the truck acts like it gonna shut off....when getting a jump, the truck fires right up, couple minutes...


Your battery is definitely low. First clean the terminals on the battery and the inside of the terminal rings on the wires. If you have a slow charger put it on that overnight and see if it holds a charge. If it still keeps depleting or doesn't charge overnight then either your battery or your alternator are done....possibly both. So take the battery to have it load tested. Most places that sell them can test them. If the battery is done replace it then test the battery with a volt meter. If the old battery is still good put it back in the vehicle and test the voltage with a volt meter. With the engine off the voltage should read 12 volts (once its fully charged or if its new) with the engine running it should read around 14 volts. If it is way higher than that or it doesn't go up at all your alternator requires replacing. Alternators are fairly easy to replace but if you don't feel comfortable with that take it in to a mechanic.

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Car will start when it is being charged, after charger is removed car still runs, when car is shut off it will not restart


could be battery or alternator. Check voltage at battery with engine running. Should be at least 14 volts. If yes, alternator is working.
After charging, battery voltage should be over 12 volts, with engine off. When starting, battery voltage should not drop a lot. If battery voltage does not drop while trying to start, you may have a bad connection--loose terminals.

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I have a 06 dodge 2500 5.9L my voltmeter inside my truck reads about 9 to 10 volts when I first start my truck in the morning and my check gages light comes on. After turning my truck off for about 5...


It sounds like your alternator is not kicking in when the truck first starts. There is a wire that "tickles" the alternator to get it charging when you first start the truck, however it will start charging without that once you rev the engine up. A couple of good shots with the fuel pedal should snap the guage up to 14. If it climbs up slowly to 14 then the alternator is starting to wear out or you have poor contact.Get the alternator tested for output. If it's okay take the wires off the alternator and battery and clean up the ends so you have bare shiny metal and clamp them back down tight. Make sure you have radio codes and procedures before you unhook the battery. Hope this helps.

Sep 04, 2010 | 2006 Dodge Ram 3500 Truck

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Seems to be a direct short is there any common problem area to look at. It will not start with out a jump and needs to have at least 1000 rpms to keep running


charge your battery using a good battery charger, then have it load tested. After verifying battery charge and condition, put a voltmeter across the battery and check volts when installed, then check running volts. Running should be better than 13v and less than 14. Standing volts before starting should be 12 or better. With all lights and accessories turned on, running should be 12.9 or better and should not drop below 12.5 regardless of time. If after doing this, battery drains overnight you will need to put an ammeter between either cable end and the battery and begin removing fuses till the draw drops.to near zero. Whichever fuse results in the drop will be the system you need to test for a short or always on condition.
You cannot do any valid testing without a good battery and working alternator though!

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When I start my 2009 Chevy Silverado it shows 15 1/2 volts. Within a few minutes it goes to 12 1/2 volts. Is this normal?


This is normal, My '04 GMC, goes to around 16 at first start-up then drops to 131/2 after it runs a while.

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Charge gage is reading 18 volts


need to have alternator output checked. sounds like the voltage regulator is going out. this is inside alternator.if it starts charging this high it can blow your bulbs and damage computers

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