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Batteries for my 7.3l

 
  #1  
Old 02-15-2016, 01:19 PM
gtadim
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Batteries for my 7.3l

I've been reading the various posts here on batteries, but I guess I just can't seem to wrap my head around it. why do I have to change my batteries in my Excursion every two years? I've been using the Costco batteries like a lot of the posts mention, but I just can't seem to get more than two years out of them. Costco customer service is starting to question me as to why, saying something doesn't seem right. But I'm not sure that if I switch to Optima's or Motorcraft or Diehard that they'll last any longer, and around here those batteries are quite a bit more expensive than the Kirkland brand.
I noticed my truck wasn't startng with "authority" like it usually does, so I cleaned the terminals and tested the batteries with my load tester and CCA tester. They tested good. They both had a voltage reading of 12.84V, so I reinstalled them and the truck seemed OK until today. When starting it this morning, it stared but it was a weak sluggish kind of start. I think it's the batteries but I'm not sure. Could it be something else? New alternator 8 months ago, starter replaced about 2 years ago. Any suggestions? Thanks, George
 
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Old 02-15-2016, 01:25 PM
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Do you have any accessories that are causing a draw when the truck is off?

Do you know what the voltage is from the alternator when the truck is running?

If your around 12.8 volts from the alternator it's not doing a good job charging the batteries and could be a ground issue.
 
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Old 02-15-2016, 01:25 PM
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If you're getting a good load test, it's sounding like either a weak connection somewhere or your starter. I'm going on 7 years on my Costco batteries, and they're just now showing signs of weakening.
 
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Old 02-15-2016, 02:47 PM
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I would have to agree with everyone else... loose connection. or bad alt.
Mine after 6 yrs is still putting out 14.1V I run the Duralast Golds on my truck and I just changed them last month after 5yrs almost to the day.
If connection doesnt do it...then you can always put a meter in-line on one of the positive battery cables and note how many amps are being pulled.
If it seems high, then start pulling fuses one at a time until you see the amperage draw decrease. That will at least narrow down which circuit to look at for a voltage drain issue.
 
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Old 02-15-2016, 03:19 PM
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12.8v with engine off & surface charge removed is good,with engine running around 14.1,may need to load test batteries
 
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Old 02-15-2016, 04:36 PM
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where did you get the alternator?
my bet is the alternator is not up to sniff.
 
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Old 02-15-2016, 05:41 PM
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My interstate batteries just crapped out after 4 years just ordered new 160 amp alt I think the plow is killing them
 
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Old 02-15-2016, 06:03 PM
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i have a custom built 240 amp alternator on my 02 because of the plow, air compressor, and strobe bar. at full draw i need 185 amps.
but i very rarely have everything running.
 
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Old 02-15-2016, 06:58 PM
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I agree with everything said above. I'll add do NOT switch to Optima batteries their quality has suffered dramatically since moving operations to Mexico. I've had 3 fail in the last 17 months, 2 red tops & 1 yellow top, all were in Jeeps. One red top died after 4 months!
I'm running Diehard platinums in my 7.3l & Jeep. Bombproof batteries with outstanding warranties. Heat kills batteries and diesels create heat...
 
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Old 02-15-2016, 07:04 PM
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Don't overlook the starter as a contributing factor. Problem is, once you get the aftermarket parts, they never seem to last as long as they should.

My guess is both the alternator and starter are contributing factors from being in a borderline condition.
 
  #11  
Old 02-15-2016, 08:27 PM
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Originally Posted by tjc transport View Post
i have a custom built 240 amp alternator on my 02 because of the plow, air compressor, and strobe bar. at full draw i need 185 amps.
but i very rarely have everything running.
Alt-zilla!!
 
  #12  
Old 02-15-2016, 09:25 PM
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Don't forget to look at the other end of the battery cables. I ohmed mine out and I had a bad ground to the engine on the driver-side battery.
 
  #13  
Old 02-15-2016, 10:16 PM
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I think you definitely need to look over the wiring and see what is going on.

Nicmike posted these below in the Excursion forum.

https://www.ford-trucks.com/forums/1...tor-eater.html

https://www.ford-trucks.com/forums/1...ternators.html
 
  #14  
Old 02-16-2016, 06:05 AM
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Originally Posted by Tugly View Post
Don't forget to look at the other end of the battery cables. I ohmed mine out and I had a bad ground to the engine on the driver-side battery.
I would like to hear more about ohming out the ground on the batteries. Can we determine that the battery ground connection is 100% with an ohm test? I figured that we could get a good ohm reading but still have a bad connection because the contact area is so big.
 
  #15  
Old 02-16-2016, 07:05 AM
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It should be zero ohms from end to end.
 

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