The reason you have 2 batteries is because the truck manufacturers are in a conspiracy with the battery manufacturers. They all decided that if you could afford a diesel engine, then by golly you could also afford to pay for 2 batteries.

 

a battery on each side keeps weight balanced for the high speed curves diesel pickups often encounter on the track... i thought everyone knew that

 

Nothing a lead block can't fix!

 

Then my guess was pretty darn good, I'd say.

 

lol lol thats funny right there

 

Thanks Guys, looks like the charge worked fine, but we'll see after a few weeks.

 

The Battery Light comes on sometimes while I am driving on my 2006 F250 Super Duty. The Alternator is putting out 14.2V when the light comes on. I was told that the battery were recently replaced. Any Ideas why?

 

Mine did the same for awhile. I had replaced the 2 yellow top AZ batteries with 2 red top Optimas. My alternator was putting out well too. It has now stopped. I dunno.

 

After a 13 hour day I needed a good laugh. Thanks !!!

 

Glow plugs work on resistance. Cold, they may draw up to 25 amps each. as they warm up the draw will go down. when they are all fired up and hot, 7-10 amps each.

So it pays to let the GP's heat up thoroughly in the winter ( well after the WTS light on 7.3L's). That way you will have more amps available to start with.

I shot a video a while back for some OBS guys on another forum. These are glowplugs that aren't supposed to burn out. (they didn't either).

http://www.youtube.com/watch?v=e7Azfql5AEU

 

Just recently (last wk) replaced both in my 7.3 - parts guy (kid really) tested each - batt 1 0amps @ 8v & batt 2 750cca @ 11.8v. He said - oh you just need 1 batt - I told him no, I need both since they are connected in parallel and the 1 good batt has been trying to charge the bad one & will probably trash the new battery in short order - when you have 2 its better for them to be balanced so one doesn't draw current from the other. Buy same date code batts if at all possible - they'll last longer since they are of equal age

 

Im a Interstate battery guy

 

Good info. It's convinced me to buy a new battery. I replaced one Motorcraft with an AZ Yellowtop shortly after I bought the truck 2 years ago. They've only gone dead once when lights and stuff were on for awhile, but did charge right up. I'm not willing to replace a two year old battery, but I have no way of knowing how old the remaining Motorcraft is.

 

in 1983 i bought a f350 with a 351 h-o engine.i had a choice of 2 batts or 1 bat and and a toolbox where the second batt sat. since i lived in fla. i went with tha 1 batt and the tool box. fast forward to new york in the 90's,2 batts are way to go ,and change them together to save your ficm.

 

Personally I love my dual battery setup. Not only I have a 1300 lb liftgate that I can use for loading up to 10,000 lb of stuff on my flatbed and still have power for engine start up, but I am also using 8,000 lb winch for loading 8-9k lb forklift on my bed. That takes some serious current for quite few seconds.
To top it -just weeks ago my alternator failed on night drive. I drove 40 miles to the destination with lights on the truck and trailer on and still had enough power for couple of morning starts.