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I have a 6.0L diesel that is not a daily driver so it sits for days and even weeks at a time. When I go to start it the batteries will be run down to the point that sometimes the truck will not start and I will need to charge the batteries. I was thinking about installing a battery tender and leaving it plugged in so the batteries will stay charged. Anyone else have this problem or use a tender and can recommend one? I'm looking at the tender in the link.
Good idea sounds like your the perfect candidate for a battery tender. If you've killed the batteries multiple times you may want to have them and the alternator tested. Remember proper voltage is very important to the ficm.
I'm certain that battery tender is better grade than the one my Father-In-Law used on his camper. His was a harbor freight model. His shorted out and cost him a motorhome. Granted, his battery tender was old, Just make sure it's in good working condition. Honestly though, weeks shouldn't be long enough for the batteries to die. Months, then yes, that may happen. How old are the batteries in the truck now?
A tender or other low micro-amp maintainers are excellent for storage but aren't suited at all to recharging large batteries especially high amp start batteries wired in parallel. A "dumb" charger capable of providing around 20 amperes would be properly sized for charging to 100%. At that point a float charger would then be perfect.
best bet, based on lessons learned, for the reasons already indicated about failing chargers......take the batteries out of the truck and trickle charge them on a bench. we can get into a lot of scientific debates as to why trickle (smart/dumb, etc) charges damage vehicle electronics and its not worth learning the chants to sing while spinning around on one leg while you tickle the foot of the other leg.
I use to use a Schumaker 1.5amp trickle charge on my old 1996 7.3 with no problems. Like you, it would sit for a few weeks or more between outings. With it, I never had a starting problem. In the 15 years I owned the truck, i replaced batteries only 3 times with the last change being about one year before I sold it.. The original Motorcraft batteries lasted 7 years.
I own multiple "vintage" rides. They are not daily drivers, obviously. Each is on a Deltran Battery Tender Plus. One has been so maintained now for 11 years without incident. The battery stays in the car, connected.
best bet, based on lessons learned, for the reasons already indicated about failing chargers......take the batteries out of the truck and trickle charge them on a bench. we can get into a lot of scientific debates as to why trickle (smart/dumb, etc) charges damage vehicle electronics and its not worth learning the chants to sing while spinning around on one leg while you tickle the foot of the other leg.
This is probably a good idea. I don't always follow it but it's important to know, so people can make their own decision. I disconnect them when lightning storms are nearby, because household mains voltage can really spike during a nearby strike.