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Gen light is on, truck wont start.

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Old 12-25-2013, 08:57 PM
BrandonBuc'em BrandonBuc'em is offline
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Default Gen light is on, truck wont start.

i started my truck 3 times fine today, tonight i went to a buddys place and when i went to leave my truck wont start. i see the gen light on. i assumed the alternator is bad. now my uncle is telling me a jump start will get it running is this true?
thanks in advance
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Old 12-25-2013, 08:59 PM
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Gen light?

Try a jump start, only one way to know if it will work...
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Old 12-25-2013, 09:01 PM
BrandonBuc'em BrandonBuc'em is offline
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gen is short for generator, im just trying to get some input from some guys that have had this issue or have some knowledge. thanks for your comment buddy merry christmas
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Old 12-25-2013, 09:06 PM
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Well it could be a bad alternator. See if it will jump start. Best thing to do is take it to an auto parts store and have them test the alternator and/or battery
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Old 12-25-2013, 09:10 PM
BrandonBuc'em BrandonBuc'em is offline
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toe trucks are expensive lol. i have a multimeter, i cant check it cause my truck is at my brothers and i have no ride there, im kinda hoping a jump start will do the trick to at least get it home.
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Old 12-25-2013, 09:56 PM
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Before you hook up the jumpers test voltage at the battery. Anything below 12.0 is dead normally (sometimes even up to 12.3 can be). When you jump it, leave the jumpers hooked up for a while so you have enough charge to get home. After you start the truck voltage should show around 14.
Something you can try to get by for a very little while is tap the top of the alternator. Sometimes the brushes inside it are worn and stuck, so a good tap (not a hit, just a tap) will loosen them so it can charge for awhile.
Hope some of this helps.
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Old 12-26-2013, 07:07 AM
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thanks alot buddy. im gonna try this when i get a ride out to my truck.
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Old 12-26-2013, 10:16 AM
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Generators haven't been used since the 50's or early 60's.
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Old 12-26-2013, 10:46 AM
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Does it crank at all?? Mine did that once and it was the main ground...when you jump it, put the negative cable on the big ground inside the right hand fender....
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Old 12-27-2013, 03:53 AM
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yes it cranks just fine, i need to test voltage. good news is im going today. hopefully i can get her home. thanks for the comments fellas
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Old 12-27-2013, 09:36 PM
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alright, so today i gave her a jump, didnt start. tested the volts at the battery and alternator, off postion at the battery was 12.3, off at the alt was 12.2, on at the battery was 14.5, on at the alt was 14.5. still wouldnt cut on. so i came back tonight thinking maybe im a dumb *** and its out of gas, so i put some gas in. when i tried to start it, it was barely turning over. like struggling just to turn. so now im thinking battery is dead and/fuel pump is done, starter is done or maybe even the fuel filter is clogged. my cousin said it might even be the rotor on the distributor cap. guys im at a loss for words. HELP!
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Old 12-27-2013, 09:45 PM
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Barely wanting to turn over sounds like a dead or drained battery.

Might need to bring out a battery that is known to be good and see if the truck will start with a fresh battery.

Need to have your current battery load tested. (Not quite the same thing but the battery on my riding mower always tests at "acceptable" voltages, but it can't turn the motor over itself, I always have to jump it off with another battery.)
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Old 12-27-2013, 09:50 PM
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yeah a dead battery makes sense and maybe this mornign when i jumped her, was outta gas, so now its got gas maybe a jump will work. man i dont know. but thanks for your comment buddy
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Old 12-27-2013, 09:54 PM
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It would seem to me either the battery is toast or the alternator crapped out which drained the battery.

If the battery is drained enough (even if the voltage looks good) it may not start with a jump.
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Old 12-27-2013, 10:01 PM
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how do i figure out which is defective?
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Old 12-27-2013, 10:07 PM
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Quote:
Originally Posted by BrandonBuc'em View Post
how do i figure out which is defective?
If you can take a good battery out and see what it does that may give you the answer.

2nd option is to have either the battery load tested or the alternator tested, most auto parts stores will do this for free, the battery is easier to get out for testing purposes than the alternator.

I'm sure there's an easier way to test the alternator, but I'm not sure how to go about that...

If it were my truck I'd start with the battery.

If the vehicle you're using to drive out to your truck has a battery that will work in your truck you could swap them, shouldn't leave you stranded to try a start or two...
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Old 12-27-2013, 10:25 PM
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alright ill give that a try tomorrow. thanks allot man
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Old 12-28-2013, 12:20 AM
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Stewie01 is on the right track. Start off with a known good, AND CHARGED, battery. Check voltage on battery before trying to start so you have a reference point (should be around 13 volts). Starter should spin like you're use to. If it doesn't you probably have a starter issue, along with whatever else is acting up.

Now if the truck starts, check your voltage again like you did. You should see between 13.8 and 14.8 volts with it running (This kind of depends on how discharged the battery is). If the reading after starting is the same or lower, or 14.9 volts or higher, then alternator is bad.

Definetly have your current battery tested. If possible make sure it is fully charged when you take it in. A battery with a low charge will give false readings, and some countermen just don't understand that concept (or understand it too well... IE- low battery= bad test= "Hey, you need a new battery because this one tested bad.").

Best of luck and please keep us posted.
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Old 12-28-2013, 12:32 AM
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im taking my battery to an advanced auto parts tomorrow for testing/charging. go from there. i will keep you posted buddy. thanks for all the help
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Old 12-28-2013, 09:29 AM
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If the battery is dead, it will automatically fail any test. Needs to be fully charged first.
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Old 12-28-2013, 09:29 AM
 
 
 
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