![]() So many people had a worn-out Walmart battery that kept going dead then wired in a $300 Optima yellow top and it still kept going dead just as fast. I know some people try to be cheap, but if if one of your batteries go dead in these trucks, you should replace both of them at the same time. So for that reason you should always have two of the same battery (both starting, or deep cycle, or whatever) and hopefully similar age. One thing I read over and over again is that for rigs that only get used occasionally, if you don't have a cutoff switch for one battery, they will constantly try to equalize and both will go dead much quickly than a single battery. I used a 4 position Perko switch (1-2-BOTH-OFF) so I could always have one battery I knew would start the truck after winching of playing the stereo or whatever if I chose to turn the switch. I'm far from an expert, but I did wire in my own dual batteries in a S10 on 42s years ago and did way too much research beforehand. While I can't do screenshots, I will include a rough diagram of what I'm talking about above: The primary battery has a negative connection at this same point. Similarly, its negative cable connects directly to the chassis in one spot with no negative wires going directly to the primary battery. This path through the positive terminal of the starter is also its connection to the primary battery. Its positive cable connects directly to the starter and nothing else. The driver side battery is the "secondary". It is grounded to the chassis in numerous places, as well as presumably the engine block. ![]() Comes with all trucks, regardless of dual batteries or not, and connects directly to the Battery Junction boxes on both sides of the truck in addition to the starter. The passenger side battery is the "primary". There is no isolator, so they do not act as a "starter" and "house" battery configuration. This will be devoid of screenshots because I don't know AllDataDIY's policy around them.įirst of all, something that's more well known: the batteries are wired in parallel so they both contribute current to starting, as well as act as one large battery for capacity. They don't offer anything for the newer model years yet for the Super Duty. I also don't know how different things were in previous generations. While I doubt this has changed for 21MY and 22MY, it's technically possible. Of note: this information is from wiring diagrams for 20MY. Hopefully this will help folks with general knowledge, troubleshooting, and modifications.Īs a part of the electrical planning for my truck, I went ahead and paid for AllDataDIY so I could get wiring diagrams. ![]() I know the wiring for the factory dual batteries has always been a bit nebulous, so wanted to shed some light on it.
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