Cummins 4BT & Diesel Conversions Forums banner
1 - 5 of 5 Posts

·
Registered
Joined
·
13,298 Posts
The preferred grounding on a Cummins is battery direct to engine block and then engine block to frame. The starter of course will be grounded to the block. Jumper grounds can go from the frame to various body parts. On cable size, the preferred is 2/0 positive and ground cables. That would be twice as big as you 1/0. No such thing on these creatures as too big when it comes to cables. Slow cranking on these engines can be one of several possible issues as has been pointed out. Cables too small (your 1/0 is probably OK), bad wire connection (possible corrosion), weak battery, or weak starter. If you had this engine running in a vehicle previously, the starter probably isn't the wrong voltage but never hurts to check. There appears to be an ID tag on the starter so you should be able to verify that.
 

·
Registered
Joined
·
13,298 Posts
You can run a single battery on these engines but 2 can be nice especially if you live in a cold climate area. A single should be in the size of 800 CCA. The early Dodge Cummins 6bt had a single but it was around 1000 CCA or a tad more. They soon decided duals were better. The one drawback on duals is if one battery gets weak you have to replace both.
 

·
Registered
Joined
·
13,298 Posts
2-3 rotations and then it stops is beginning to sound like a stater problem, but it could be wiring as well. If the new wires don't cure the problem a starter rebuild may be needed. Have you had the battery tested?
 

·
Registered
Joined
·
13,298 Posts
On the exhaust, whether you weld it all up or use clamps is your call. There are clamps that don't leak. A bit more expensive than the plain ones you get at the muffler shop but they work. 3" ones run in the $9 and up range depending on size and material. These are what you often find on big trucks. They come in versions that join equal size pipes and unequal sizes.
Automotive lighting Gas Audio equipment Auto part Metal
 
1 - 5 of 5 Posts
Top