3410 w/Diesel engine

[Icuby]

This has a Izuzu engine and it is hard starting. by this I mean that it turns over very slow. Have installed 2 new rebuilt starters,new battery ,new bat. cables. If I hook bat.charger to bat. then it iwill turn faster and eventually will start.. The new bat. is the same size as the one removed{550 cca}.The original starter worked good other than for the drive teeth being clear gone from wear, or???? I am wondering if someone has wire diagram that goes to starter-solonoid. Thanks

 

[Tazza]

As you have installed a new battery and a rebuilt starter i'm thinking your issue may be the battery cables.
Try cranking it then feel the cables and connections to the battery, chassis, engine, see if you can find hand hot spots. Heat means you are getting power loss. My S250 had corrosion causing it to crank slowly.
With that said, be careful as IF this is the issue, the points o high resistance can get very hot, easily hot enough to blister your hands.
Another thing i have done is to add jumper cables. Leave the battery in, and run a second ground and second +ve cable direct to the starter.

 

[Tazza]

As you have installed a new battery and a rebuilt starter i'm thinking your issue may be the battery cables.
Try cranking it then feel the cables and connections to the battery, chassis, engine, see if you can find hand hot spots. Heat means you are getting power loss. My S250 had corrosion causing it to crank slowly.
With that said, be careful as IF this is the issue, the points o high resistance can get very hot, easily hot enough to blister your hands.
Another thing i have done is to add jumper cables. Leave the battery in, and run a second ground and second +ve cable direct to the starter.

One other thing i didn't think of straight away, ensure the aux hydraulics (if fitted) are not stuck on. If they are, it will bog the engine down to the point it's hard or impossible to start.