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Author Topic: having trouble starting 6.2 diesel  (Read 66377 times)

Offline gold84gmc

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having trouble starting 6.2 diesel
« on: January 09, 2010, 07:18:25 am »
i cant start my diesel because the batteries are too dead, so i was wondering if i could run it temorarily with one battery? because im going to get one new battery and was going to put the new one in and take out the other one so that only the new battery is in
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Offline gold84gmc

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having trouble starting 6.2 diesel
« Reply #1 on: January 09, 2010, 12:08:52 pm »
im having trouble starting my gmc diesel with a 6.2, when i start it, it seems like the batteries are too dead to be able to start, so today i went and bought a new battery, put it in and tried starting it, and it still wouldnt start, so i took a battery out of another car that we have with a good battery and put it in my truck and still wont start, right now i have the charger on it but its only a small charger(isnt on wheels) to see if that helps

how long does it take the engine block heater to warm up?
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Offline VileZambonie

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Re: having trouble starting 6.2 diesel
« Reply #2 on: January 09, 2010, 12:46:24 pm »
You have dual batteries?
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Offline gold84gmc

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Re: having trouble starting 6.2 diesel
« Reply #3 on: January 09, 2010, 12:53:56 pm »
yes...one is new and the other one isnt new but it has a good charge
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Offline VileZambonie

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Re: having trouble starting 6.2 diesel
« Reply #4 on: January 09, 2010, 12:55:38 pm »
Dual batteries should always be replaced in pairs of smake like and kind. Just keep that in mind. Put a volt meter on both batteries. They should read the same. Crank the engine and see what the voltage reading drops to.
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Online Mr Diesel

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Re: having trouble starting 6.2 diesel
« Reply #5 on: January 09, 2010, 03:19:16 pm »
The batteries need to be big enough to crank it over fast enough. MINIMUM 750 cranking amps. I personally wouldn't put anything on with less than 900. Any cold weather at all will drag down anything but the biggest batteries.

If they are good then clean the terminals and cables real good with wire brush. A poor connection anywhere will lose a LOT of starting amperage. If the engine has much wear it needs to have as much cranking speed as possible to start. It's amazing how much easier these engines start when they turn over nice and fast.

Block heater should heat the engine up to 60* or more in a few hours.
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Offline gold84gmc

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Re: having trouble starting 6.2 diesel
« Reply #6 on: January 09, 2010, 10:13:12 pm »
ok well i left my block heater plugged in for about 2 hours and got the truck to start, but then i had to go to work so i couldnt do anything else to it, and im leaving it plugged in over night so hopefully tomorrow i can get it started

everytime i try starting it the battery cables keep coming loose on their own, when they were tight before i turned over the engine, can i put lock tight or any washers or anything on there to keep them from coming loose?
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Offline beastie_3

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Re: having trouble starting 6.2 diesel
« Reply #7 on: January 10, 2010, 01:00:50 am »
Are they side mount cables? what condition are the terminal and wire threads?
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Offline Irish_Alley

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Re: having trouble starting 6.2 diesel
« Reply #8 on: January 10, 2010, 01:04:02 am »
might need to replace the bolt.
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Offline gold84gmc

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Re: having trouble starting 6.2 diesel
« Reply #9 on: January 10, 2010, 07:18:18 am »
yes i have side posts

everything looks fine, they thread in fine and come out fine, they come lose after cranking the engine

my dad told me to put lock washers on(the kind with "teeth" around the edge)
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Offline Marc

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Re: having trouble starting 6.2 diesel
« Reply #10 on: January 10, 2010, 09:27:48 am »
Are there glow plugs or an intake heater and are they functional? 
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Offline VileZambonie

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Re: having trouble starting 6.2 diesel
« Reply #11 on: January 10, 2010, 11:04:54 am »
use a 3/8x16 short bolt with the appropriately spaced star washers so the bolt is tight and the cables are tight.
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Offline gold84gmc

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Re: having trouble starting 6.2 diesel
« Reply #12 on: January 10, 2010, 12:33:09 pm »
Quote from: Marc on January 10, 2010, 09:27:48 am
Are there glow plugs or an intake heater and are they functional? 

every diesel has glow plugs, and i dont know about an intake heater...as far as i know the glow plugs work because the light comes on on the dash and then goes out when theyre warmed up
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Offline VileZambonie

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Re: having trouble starting 6.2 diesel
« Reply #13 on: January 10, 2010, 12:59:10 pm »
Quote from: gold84gmc on January 10, 2010, 12:33:09 pm
Quote from: Marc on January 10, 2010, 09:27:48 am
Are there glow plugs or an intake heater and are they functional? 

every diesel has glow plugs,

Not true.
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Offline gold84gmc

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Re: having trouble starting 6.2 diesel
« Reply #14 on: January 10, 2010, 01:15:06 pm »
oh my bad i thought they did
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