Best battery

Re: Best battery

Postby Mmusicman » May 19th 2020, 11:56am

Overcharging your batteries (looks like almost 16v in pic) may damage them or shorten their lives. Might want to clean up that ground too.. that's a lot of current to pass though a rusty bolt.
Good luck
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Re: Best battery

Postby chevymaher » May 19th 2020, 1:16pm

Mmusicman wrote:Overcharging your batteries (looks like almost 16v in pic) may damage them or shorten their lives. Might want to clean up that ground too.. that's a lot of current to pass though a rusty bolt.
Good luck


My boat is doing the same thing. So I looked it up. It does hurt the batteries. It causes them to overheat. And excessive vibration tears the lead plates up.

I called and talked to the place I get my electrical stuff. They test and give you a paper of the test. They said it isn't good. I like them cheap and dependable.

I got another alt on the way new or not it isn't good.
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Re: Best battery

Postby Rod's Trucks » May 19th 2020, 4:46pm

MM said it. Check the grounds!

The regulator in the alternator measures, and regulates the voltage to 'Ground' which should be the engine block and chassis frame. A poor chassis ground connection can raise that system voltage, when measured at the battery.

Then measure voltage drops across all connections ( see below) , and along the length of any substantial cable. Anything over .1 volt is a problem connection. Battery terminal connectors, and the lugs on the other ends, can corrode internally and yet look just fine.
To test for voltage drops at connections: Put one voltmeter lead ( Positive lead to the most positive side of the connection; ie + post if measuring there) on the battery post and one on the connector ( you should measure 'O volts then). Now have somebody try to start the motor, while watching the voltmeter ( an old analog meter, set on a low voltage range, works best for this, so you can see the needle swing, and not have to try to read the rapidly changing numbers on a digital meter).
The resultant reading, sometimes over a couple of volts, is the voltage loss through that connection when it's load is applied. It is quite an eye-opener to some folks. It will very quickly show a poor battery cable connection.
this test also works for things like the notorious the blower motor connector, which we all know often melts from the heat generated by the high current going through the poor connection!
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Re: Best battery

Postby Mmusicman » May 19th 2020, 5:43pm

Rod's Trucks is RIGHT ON!

REAL SIMPLE QUICK TEST:

* Put one meter terminal directly on the alternator case..
* Put the other meter terminal on chassis body (not ground lug)

DO THIS OF COURSE WHILE THE ENGINE IS RUNNING WITH FULL LOAD.
If you see ANY voltage whatsoever... then you have a voltage drop somewhere.
(use meter on lowest voltage setting)
You may also want to check alternator chassis to battery negative post

Same also applies to measuring B+ side...
* One meter terminal directly on alternator + post
* Other meter terminal on any B+ locations (batt, fuse block, etc) ...
(check again for even the slightest voltage which again means voltage drop)

Do same tests with battery B+ and grounds too
Do this test in both charging state, and resting state (engine off).. since charging may skew results.

Again.. testing while engine running under full load.
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Re: Best battery

Postby Rinny [OP] » May 19th 2020, 10:13pm

actual voltage out put is 15.5 volts which in reality is about 1 volt more than my winch specs call for?
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Re: Best battery

Postby chevymaher » May 19th 2020, 10:18pm

My boat is 15.7 The people at JB Electric said it should be under 14.5. Mine works fine i just dont like that high a voltage so I am buying another one.
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Re: Best battery

Postby Rinny [OP] » May 19th 2020, 10:33pm

Just checked the volts again. Was 15.7 at the bat, and the alt. Cleaned the ground on the fire wall and it now reads 15.10 at the bat and the alt. I will clean the battery terminals later and see I it drops further.
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Re: Best battery

Postby Mmusicman » May 19th 2020, 10:40pm

My sources say..
13.8v - 14.2v is considered the proper charging voltage (nominal battery voltage is 12.6v).
Current/amperage is merely supplied on demand (to maintain above voltage)

Slightly higher voltage is more like a faster charge...
but too much will heat up a battery and shorten it's life.
Slower charge is always preferred.. but somewhere in between is most practical.
Higher than 14.5v-15v (long term) is considered damaging.
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Re: Best battery

Postby Rinny [OP] » May 19th 2020, 10:44pm

Mmusicman wrote:My sources say..
13.8v - 14.2v is considered the proper charging voltage (nominal battery voltage is 12.6v).
Current/amperage is merely supplied on demand (to maintain above voltage)

Slightly higher voltage is more like a faster charge...
but too much will heat up a battery and shorten it's life.
Slower charge is always preferred.. but somewhere in between is most practical.
Higher than 14.5v-15v (long term) is considered damaging.

Good eye on the fire wall ground bolt. I will clean the battery terminals and see where it brings me. I will be comfortable under 15 I think. Dropped .06 with cleaning that fire wall bolt.
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Re: Best battery

Postby Rinny [OP] » May 19th 2020, 11:37pm

Couldn't wait till tomorrow. Cleaned the ground on the battery, no change. Cleaned the dedicated ground on the alternator side and there it is 14.7. lil fluctuation between 14.3 and 14.7 but I can live with that!!
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Re: Best battery

Postby Rinny [OP] » May 19th 2020, 11:49pm

Lil die electric and a rubber boot on the fire wall ground and there it is on the volt gauge!!
Thanks for the input guys!!
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Re: Best battery

Postby Leeann_93 » May 19th 2020, 11:52pm

Much better!

Cleaning up the firewall ground, core support ground and any other ground I can see and reach usually is the first thing I do to one of these when I acquire them - they're almost always crusty and rusty.
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Re: Best battery

Postby Rinny [OP] » May 19th 2020, 11:55pm

Everything was spotless and coated when I did the 5,7 swap, every nut bolt and screw, no kidding. Take a look at the thread, cleaner than new. The salt air near the ocean reeks havoc!! I m not the very best but I do my very best when I do something. Always have worked to the best of my abilities.
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Re: Best battery

Postby Leeann_93 » May 19th 2020, 11:58pm

Rinny wrote:Everything was spotless and coated when I did the 5,7 swap, every nut bolt and screw, no kidding. Take a look at the thread, cleaner than new. The salt air near the ocean reeks havoc!!


Crap - I forgot where you are. I do remember the spotless, beautiful bolts and screws. I live in MD, near the Chesapeake Bay (real close to a river that feeds the bay and is brackish here), and I have to be careful with anything that's going to be outside.
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Re: Best battery

Postby Rinny [OP] » May 20th 2020, 12:01am

I run the beach quite a bit, stay away from the water but it is real tough on the van. My 3 year old outter rockers are paper. Going to do the rock slider mod. Starting Saturday!!
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Re: Best battery

Postby Leeann_93 » May 20th 2020, 12:06am

Rinny wrote:I run the beach quite a bit, stay away from the water but it is real tough on the van. My 3 year old outer rockers are paper. Going to do the rock slider mod. Starting Saturday!!


Gonna get it done over the holiday weekend?









:lol: no, I wasn't serious. I don't run my Astro on the beach and the PO apparently didn't drive it in winter (why AWD, then?) so my rockers are okay. But if I had to replace them, my husband would weld them in or I'd spend a full day grinding off the mess.
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Re: Best battery

Postby Rinny [OP] » May 20th 2020, 12:09am

No sure how long it will take. I will do all the fab work but I have an artist of a welder gluing them in. Only problem is he can only give me a few hours a week so we will see.
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Re: Best battery

Postby Rod's Trucks » May 20th 2020, 12:26am

Glad you found the problem areas!
My old navy (Submarine) training says anything above about 14.5 will begin to make the battery 'GAS'
That means it is slowly ( or more quickly as the voltage rises) boiling the electrolyte and generation Hydrogen, and Oxygen. That mixture can be explosive in the right proportions ( or wrong-depending upon how you see it).
In the long run, it is detrimental to good battery life.
Your winch may run faster and stronger, but your battery will die early, and incandescent lamps fail very much faster as the voltage rises above the design voltage...although they do produce more light....during the time they operate.
It is something like a 10% increase in the operating voltage, decreases the life by a factor of 100. I will look it up again. It is a very interesting chart.
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Re: Best battery

Postby Rinny [OP] » May 20th 2020, 12:38am

Rod I am going to keep an eye on it over the next week to make sure I am under 14.7, I would like to see 14.5. How much fluctuation should there be in the volt meter when it is running, any? I think I am bouncing between 14.3 and 14.7
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Re: Best battery

Postby Mmusicman » May 20th 2020, 1:47am

IMPORTANT FACTOR FOR CONSIDERATION:

I don't know if this will apply to your alternator or not (but it does mine)...
I have found quite a bit of charging voltage variation when cold vs hot.

I typically see almost 1-2 volts higher (on dashboard gauge) when first started cold.
(typically somewhere above 14v cold .. similar to your photo)
Mine drops just below the 14 mark after it warms up (under load).

I don't consider this dash gauge accurate.. I just use it for reference to see what's going on.
I also think it see a wider range of readings because of where it's signal may be picked up.

I'd suggest once you get things done.. take some accurate voltage readings hot vs cold.

Voltage will typically fluctuate somewhat at idle.
You'll also want to take some voltage readings at higher rpms too.
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ElectricalDiscussion specific to electric components of vans. Category for alternators or batteries, starters and ignition parts, anything 12v and electrical issue like fuses, circuitry, wire, terminals, switches, connectors, bulbs, relays, and wiring. Voltage and amperage diagnosis.
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