D-21 Questions

I am wondering what the best battery for a D-21. Recently I started mine thats been sitting for 7 years. I put a boat (marine) battery in it but it just wasnt enough to spin it over fast enough to crank, so after adding jumper cables from an F-250 straight to the starter, it still wasnt enough, but I added a high amp battery charger to the marine battery and got it going.

Now to my question, I am going to have to buy atleast two batteries for it, I have seen some real big batteries that I assume are used in farm equipment. The times I have worked on 18-wheelers they have 4 batteries. I only have limited room in the battery box, so I am looking to see what others use, one of those huge 12 volts or two smaller ones, if so what group or type battery would you suggest?

Do you happen to know what group of battery? That battery box is only so big.  As a matter of fact I have the battery box off of it right now putting a new bottom in it, it rusted out.

The depth of the box is important.  Make sure it is at least as deep as the original.  You do not want the battery post to contact the battery cover.

Gary198101 wrote: Do you happen to know what group of battery? That battery box is only so big.  As a matter of fact I have the battery box off of it right now putting a new bottom in it, it rusted out.

Sorry Gary, I completely missed that question, Darrel is correct two group 27s is your best bet, I think 30s would fit to, but they are a bit taller, not as easy to find either.

A marine battery is totally wrong. They are made to release a low amp draw over a long period of time. You need as high an amp battery as you can get near to a group 31 as you can fit. Multiple batteries paralleled will give you maximum amp release so the engine will spin up as needed for cranking. As mentioned above, the cables and all connections should be of proper size and in good clean condition to make the most of the batteries output. 

i put 2 interstate group 31s in mine

You'll probably find that an Optima group 27 will perform at about the same level as another's generic group 31.  You're going to pay a premium for an Optima, but they are far superior at heat and vibration tolerance.  They are also maintenance free.  No more corrosion at the battery terminals.  None.

I tried to get down to the river near Port Gibson last May, Gary.  High water kept me away.  I may give it another shot next year.  Have the D21 up and running.  I'd like to have a look.

go for 2 group 31 if they fit. Rim clamps should be easy to find. If they are non power adjust i will have some available. How cold does it get in ms?

Two group 31's as stated above should be sufficient.....and look at your cables....I use 1/0 on everything and the solder -on ends.....hth

Solder makes for a fine mechanical connection but it is very resistive.  Automotive stores just don't sell heavy enough cables.  I use welding cable and good solid crimp connections.  Of course I have access to a good heavy crimping tool.  Check with your local mechanics.  You may find one with a good crimping tool.  Those of you who are still running 6 volts pay special attention.

You know Gary, if she is going to eat you alive, you better come let me take her off your hands before there isn't anything left of you!!  :-)  I'll make it as painless as possible!!

Gary, Send me some pictures too!!! Terry