Should You Replace Both Batteries In A Diesel. If one battery suffers a case post or plate failure and the group is youngish you can get away with doing a RR on just the failed one but the new group will likely not have quite the longevity of the good original. The batteries should be replaced in pairs but because Its expensive to replace two batteries at once you want to be sure youre getting maximum life from them.
We have a local dealer that has very good pricing for dealer parts. Its also very important to make sure that any vehicle diesel truck or otherwise that is running two or more batteries in parallel or series applications is using batteries that are identical in age size and type. 2011 F350 Lariat SC SWB 67L 4x4 355ELD FX4 Lariat Int Pkg 20s - Ordered 10272010.
If you have the originals in now youre due for a change so just bite the bullet and get both replaced.
After 7 years they owe you nothing and youre lucky to get this far. You can also buy or make a battery powered device to plug into the cig socket while changing batteries. The glow plug circuit draws a lot of power and the injectors require high voltage to fire. Generally speaking youll want to replace both batteries as a weak battery in a dual battery setup can cause the new battery to fail prematurely.
