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A quick and dirty test: Connect a voltmeter to the main positive and chassis ground so that you can see it from inside the vehicle. Disconnect the AUX connection at the main battery so that everything is powered by AUX. As quickly as possible, jump in the truck, close the door, push the big...

That's what I'm thinking. Also, what would be the point of isolating the two if the loads are in the same proportion as the capacities - so well matched that you can't tell from the voltages that they are in fact isolated? Yes, it seems eminently reasonable. But that's not what happened in my...

Here's an oscilloscope trace from a cold start. Blue is N1. Yellow is N2. The vertical scale is 1V per division, centered at 9V. Horizontal is time, scale is 20ms per division, 200ms total. Trigger was a 10V falling edge on N2. Analysis: For the first 65ms, N2 is at 12.4V and the N1 is at...

I'm looking for hard evidence. I don't have a lot of faith in the wisdom of the forum. The factory service manual inexplicably fails to call out this highly salient feature. It has only this to say: and and The FSM is half-ass in places, but it certainly doesn't describe a system that...

The claim that the batteries are isolated during ESS stops is often repeated. Is it true? I haven't seen any evidence to support it. I found just one post observing that the voltages of the two batteries fall in tandem during ESS events: Consider another possibility: The crank battery voltage...

I think you are right. Symptom: Jeep fails to charge battery after discharge Steps to reproduce: Discharge battery about 7Ah by turning headlights on for 32.6 minutes Drive for one hour Expected result: Battery mostly recharged Observed result: Battery 5.5Ah low Notes: Voltage came up to...

That would be a shit charging algorithm for a battery chemistry that needs to be held near 100% to avoid permanent damage.

Nope. Perhaps it's my fault for being including too much detail. I started the trip fully charged and got home to find the battery 4% low.

I see you didn't read what you've responded to.

Indeed. I neglected to mention the outside temperature was around 20C. An IR gun on the main battery showed 31.5C on the engine side and 26C on the front (windward) side, immediately before charging. The IBS would have read the temperature of the negative post, closer to the 26C. No excuse not...

There's no need for all of that. If the point is to disconnect the electrical system entirely one can simply disconnect the main chassis ground. To reset only the IBS just unplug it. But what exactly would that accomplish? I need to see if it's reproducible before doing anything. Otherwise I...

I’ve seen indications that my Jeep’s charging algorithm is shit but this surprised me. Sometimes it doesn't even try. After an hour on the trail yesterday I aired up from the battery with the engine off. This would have used less than 3Ah. Then I drove home. The charge controller had a chance...

Ford has a 7.3L pushrod V8 in their Super Duty line since 2020 and a 6.8L variant since 2023.

True, and Tacoma's lost sales account for more than 100% of the YTD segment drop. It's quite possible that 2024 mid-size pickup sales will end up with an increase over 2023. Tacoma is about 40% of the segment and a decent Q4 for Taco is all it would take to erase the deficit. I mentioned the...

Automakers whose ticker symbols are a permutation of LAST are losing market share. The obvious solution is to change the ticker symbol. That's why I make the big bucks.

Price is a huge factor in falling sales for the mid-size pickup segment in general. Where's the value in a mid-size pickup when you can buy a full-size pickup with a V8, 4WD, 6' bed and better fuel economy for less? The whole segment is looking at an 8% sales decline for the year: Model 2024...

It's that time again. Stellantis sales are down 19.8% from Q3 2023, and 17.0% YTD from 2023. Gladiator sales are down 35.3% from Q3 2023, and 21.3% YTD. Stellantis report text and detailed pdf: https://media.stellantisnorthamerica.com/newsrelease.do?id=26253&mid=425...

I wouldn't say that. Here's what you calculated for your original (non-P) 245/75R17 tire vs the ETRTO load limits. You could avoid the hassle of downtown Wrongville by skipping the footprint nonsense. You're assuming load limit is linear in pressure, i.e., load limit = 2469 * pressure / 45. If...

This is just wrong. The area of the contact patch is not load divided by pressure. It isn't even true for something as simple as a balloon. The reason? Pressure on the contact patch is not uniform. Here's a good explanation from Barry's Tire Tech. The main thing to understand here is that load...

I think this one is more realistic. The higher inflation pressure saves 1.6 cents per mile. Depending greatly on the assumptions, of course. Another way to look at it this: If the tires cost $1,500 and the gas for the life of the tires costs $10,000, then fuel cost is 6.67 times tire cost and a...