as long as you only change one at a time and leave the other connected you wont loose your settings .. remember that the + side will be live the whole time so don t touch it to the chassis or metal parts
ASE Master Auto Technician.
2001 Excursion 4x4 7.3 with Lot-o-mods (Daily Driver)
Project: 94' Isuzu FSR Crewcab 12' flatbed dump
Make sure you buy a quality set of batteries. Especially if you live somewhere it gets pretty cold. Takes a lot fo juice to egt the glow plugs gowing and to crank that diesel. I have alwasy believed you pay peanuts you will get monkeys when it comes to batteries.
2000 X Diesel, 6in Pro Comp system (all spring no block), General 35's, 16x10 Rockcrawler Series rims, Superchip tuner, Detroit Locker (Truetrac), 4" MBRP turbo back
Last yr,,,October or so,,my 06' F-350 six-O,,,had a sluggish start when getting cold,,,checked batteries,,,Pass side,,battery was toast,,,Driverside was fine,,,so I just replaced the one battery,,,,,as of Now,1 yr plus later,,,driverside original battery still going strong ! I replaced the bad one with another MotorCraft original type 850 CCA I beleive. Good Luck!
I have heard of mixed opinion's on Optima Batteries,,,and one opinion was from a Store clerk ,,,where they Sell and see the returns of the Optima batteries ! Good Luck !
Eight years on the Optima in my Sub, and it is just now time to replace. I think I made out well.
And the preferred method for diesel battery swaps is to change both at the same time. Leaving a weaker, older battery in place will negatively (battery humor!!) impact the fresh, new one. You own a diesel, spend the money.
2005 Excursion Limited 4x4 PSD with Airaid Intake, KC Light Bar w/four Pro Comp 9911, Yakima Rack w/ eight bars, C-Betr, Oilguard Bypass Filter, Jotto Desk, Banks Six Gun Tuner & Intercooler, MBRP T-304 SS Turbo back Exhaust, Icon 5" All Spring lift, Mag-Hytec front and rear diff covers, RAS, Cragar Cryo rotors, Hawk pads, 4.10 gears with Eaton LSD, 18" Eagle Alloys, 285/75-18 Goodyear Wrangler MT/R with Kevlar, PIE ...so far
Just the same as you would never want to replace just one tire on the same axle you always want to replace both batteries. Ultimately the older battery will tax the newer one. Your best bet is to find a gasser and put your second still good battery in that rig. And just my opinion of course, had the yellow top optima batteries and i say leave em on the shelf. Running two MTP65 Interstates and they are treating me well so far.
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