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Old 06-12-2015, 08:48 PM   #1
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Can New Chassis Battteries Do This?

There's no denying I'm a complete noob to RV's, so if I'm crazy or just imagining things go right ahead and say it

I posted a few days ago that a sulfur smell lead to me discover I had cooked one of my chassis batteries - it was really hot and bulging. Then, I discovered that not only were they under-powered for the coach specs (925 cca's instead of 950) but they weren't even matched up... the hot one was only 850 cca's! It's not hard to understand why it got cooked.

Naturally, I replaced them both with brand new 950 cca group 31's. Driving the RV today for the first time since I replaced them, I noticed right away that the coach fired right up in only about a second or so of cranking, as opposed to 3-4 seconds with the old batteries. That's no surprise.

Here's the crazy part:

The coach ran smoother. It shifted smoother. The throttle felt more responsive. The gauges didn't dance like they used to - which I had attributed to funky old analog gauges just doing what they do.

So... am I crazy? Am I imagining things? I'm a such a noob that I'm just making this up in my head? Or... can a properly running electrical system have that much impact on performance?

Give it to me straight, I can take it
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Old 06-12-2015, 08:55 PM   #2
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My guess is you improved the battery connections when you replaced the batteries. Old ones were probably some what corroded.
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Old 06-12-2015, 08:56 PM   #3
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You got it, the cooked battery could have been shorting internally , sucking the life out of the other one.

With mismatched batteries, it looks like someone changed 1 of a pair.

If one fails, the other is not far beyond.
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Old 06-12-2015, 09:03 PM   #4
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"The coach ran smoother. It shifted smoother..."

You are not crazy. It's a well-known fact that a freshly washed/waxed coach runs much better than a dirty one. I have no doubt new batteries have the same effect.

Years ago, I learned that red skis are much faster than any other color, so; no, you're no crazier than I am.
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Old 06-12-2015, 09:20 PM   #5
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Quote:
Originally Posted by jrbarber View Post
Years ago, I learned that red skis are much faster than any other color, so; no, you're no crazier than I am.
I KNEW IT! Now all I have do is to convince the wife and all will be right with the world once again
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Old 06-12-2015, 09:26 PM   #6
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Here's an answer a bit closer to reality. Computer controlled vehicles entered the market place in 1980. They have become more and more complex and more items are controlled by those computers.

In the beginning (1980) sensors like the TPS (throttle position sensor) did not use 12 volts as a reference voltage because it was not always going to be a guaranteed steady 12 volts. To combat that possible issue most sensors use a voltage much lower. In the case of a TPS it's a 5-V reference voltage to the CPU. When at idle it's usually around .7 or .8 volts. At WOT (wide open throttle) it's usually 4.8 to 4.9 volts.

The computers/sensors need steady reference voltages to control outputs. If your voltage supply starts dropping below 12, 11, 10, 9 etc the computers start doing strange things. As a matter of fact if your alternator were to suddenly fail as you drive things not required to keep you running will begin to shut down. Things like heater/dash AC blower motors, radio's, etc. It does that to conserve power to run the ignition and fuel system. Also as twinboat mentioned when batteries are mismatched and one is failing it acts like a high resistance or drain on the other one so the problem is compounded. You were experiencing your smart computers response to low and varying supply voltages.

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Old 06-13-2015, 02:26 AM   #7
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Quote:
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You were experiencing your smart computers response to low and varying supply voltages.
Thanks, TeJay! It's nice to know I probably wasn't imagining all of it
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Old 06-13-2015, 02:42 AM   #8
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Thanks, TeJay! It's nice to know I probably wasn't imagining all of it
You weren't imagining all of it... just some of it and yes, a red car will go faster than any other car as long as it's freshly washed and waxed. That's a scientific fact as I recall.
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Old 06-13-2015, 03:15 AM   #9
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Quote:
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You weren't imagining all of it... just some of it and yes, a red car will go faster than any other car as long as it's freshly washed and waxed. That's a scientific fact as I recall.
"Yes Virginia, there is a Santa Claus"

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Old 06-13-2015, 03:39 AM   #10
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Originally Posted by bluepill View Post
"Everything on the internet is true" Abe Lincoln
Well, if Honest Abe said it, that's good enough for me!
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Old 06-14-2015, 10:12 AM   #11
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"Honest" Abe. REALLY!! Remember, he was a politician!


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Old 06-14-2015, 01:37 PM   #12
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The bulging can be caused by a shorted cell...that changes the battery from a 12v to a 10v...so when the alternator is charging at 14.2v the 10v battery is being overcharged considerably... and is the source of the bulging....and this causes a disruption in the constant voltage and amperage needed to run the vehicle.
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Old 06-15-2015, 08:45 AM   #13
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Thanks, Boss. That explains it in a new way for me, and it makes perfect sense. Thanks!
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Old 06-15-2015, 03:01 PM   #14
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Your old batteries (Well the hot one) may have been sucking enough power that the voltage was a bit low in the system... This would have resulted in the ECM not feeling all that well.

The ECM and and it's frind the TCM (Transmission control module) control most all aspects of your drive,,and control the gauges.. Both can be bothered by low voltage or high noise power (Alternator whine from an overloaded alternator)

So yes. the batteries can do that.

IT might also be a perception issue.. but I'm voting for batteries.
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