having trouble starting 6.2 diesel

[Irish_Alley]

just cause the bats are sitting at 11 volts don't mean nothing you have to see what they are sitting on under a load, anything below i think 10v should be charged if that don't fix the drop then they should be replaced. and in a dual bat setup one feeds off the other meaning if one is week it will kill the other

[gold84gmc]

so do both batteries have to be the same CCA's? and i noticed yesterday that the new battery that i got is 730 CCA's, the computer at pepboys said it was for my truck.

so if the main battery is fully charged, but the secondary one is pretty low, it will kill or drain the main one?

and my block is working because i can feel the heat from it

[Marc]

I am sure out there on the internet there is a procedure for checking the glow plugs individually (resistance I think) and also a procedure for bleeding the fuel system. 

As for glow plugs an indirect injected diesel can have them but a direct injected diesel to my knowledge will not have a glow plug due to the construction of the engine (no precombustion chamber).  They can have a small heater plug that ignites a small amount of fuel to warm the intake air like some small Perkins engines, or an intake heater grid like a 3116/3126 cat or a 6BT cummins.  Or they may have nothing.

[Irish_Alley]

Yes the bad bat can drain the good.

[levisjohnson]

It sounds like it gets fuel initially and then dies.  I just serviced my 6.2 and changed the fuel filter.  It would do the same thing as yours.  I turned it over for about 10 seconds and then I would bleed the air out.  I did this 5-6 times and then it started fine.  I did have to bleed a little more air out a few hours later when I went to crank it again.  There should be a valve on the fuel filter, but my fuel filter is on the firewall.

Hope that helps.

[gold84gmc]

the new battery is 730 CCA's and im not sure what the other battery that i put in is...i think its less because i took it front a gas engine probably 700 or so

i have a diesel engine repair book that tells how to do stuff with the gm 5.7,6.2,and 6.5 diesel engines and i followed the procedure in that on how to bleed the fuel system

[gold84gmc]

mine has a fuel filter on the back of the intake and it also has an in-line one thats along the frame...the one on the intake was changed not to long ago, but the in-line looks like its been a while since its been changed...so i take it i should change that then bleed the system again?

[Irish_Alley]

I would get those bats load tested at the zone

[gold84gmc]

well i wouldnt be able to go to autozone because we dont have one, but i go to a vocational school for automotive technology and we have a snapon tester and a carbon pile tester that will test the battery with a load

[Mr Diesel]

gelled up fuel wouldnt cause it to turn over slow would it?

Yes, it will. If the cylinders aren't getting fuel there will be no combustion in the cylinders, which helps the engine turn over faster. I don't bother putting anti-gel additives in my fuel until it gets 15* or lower.

how do you hook up jumper cables on vehicles with dual batteries

Hook them up pos to pos, neg to neg like normal. On the vehicle to be boosted, put the cables on the battery closest in line to the starter (passenger side on your truck I think).


The filter on your frame rail is the one most likely to clog, since it is the primary. Good idea to change that one. I would probably just change it out and not bother bleeding the fuel lines. Once you get it started be prepared for it to die once that air pocket reaches the injection pump. Just crank it over some more to bleed that air out and restart it.


If you do want to test your glow plugs, it is easy. Disconnect the wire from each one and touch each one with a test light (connected to pos terminal). If it lights, plug is good.

[gold84gmc]

so i unplug one at a time and turn the key to on?...then hook the alligator clip to the pos terminal on the battery? and touch the other end to the glow plug connector?

sorry you gotta explain things better because basically have no clue when it comes to diesel seeing that this is my first one and ive never worked on one before

[Irish_Alley]

To charg duals I guess It depends on the setup it should be pos to pos and both bat grounded out which inturns doubles the cca. If that's your setup I would just hook it up like a reg bat they both should get the charg

[gold84gmc]

well i tried jumping it with my dads truck, his has dual batteries too...and we put pos to pos and neg to neg...both on the main batteries

i looked online and it said to do pos to pos and neg on the jumping battery then the other end to a ground on the the dead vehicle, it said to hook it to a ground and not to the neg terminal

[Irish_Alley]

A lot of times they say that because a dead bat can give off a gas that when you cause a spark on it can blow up in your face. That's also why they say to hook the dead bat up first

[Mr Diesel]

sorry you gotta explain things better

1. Unplug the single wire from glow plug.
2. Connect test light to positive battery terminal.
3. Touch test light to glow plug terminal.
4. If light comes on, plug is good. If light does not, plug is bad.
5. Repeat for the other 7 plugs.