Can bad batteries/atlernator affect o/d light? - Ford Powerstroke Diesel Forum
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Old 02-15-2012, 09:44 AM
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Can bad batteries/atlernator affect o/d light?

Hey everyone,

I've been having issues starting my truck recently and was planning on purchasing new batteries this weekend. Last night I had to jump my truck to get it going. I went to get a load of steel (~1600lb) on a skid to deliver to a local business today. Before I got the load, I noticed my O/D light flashed on and off. When I got to the place to load the steel and put it in park, the light quit flashing. When I left it started flashing again, and on the way back home I noticed it was slow to accelerate in 1st gear and didn't seem to shift out of 3rd. It was only a short ride home so I kept it at 50ish mph ~2k rpm. When I got home I stopped in my street, put it park then dropped back to drive and it was still slow to accelerate. (O/D light flashing all the way home) I parked it, shut it off then tried to start it and it wouldn't turn over.

Today I plan to try to get it to start when I get home, run up to the parts house and get batteries, and have them test the alternator. Is it possible that the batteries being shot and/or alternator issues can cause the O/D and tranny issues, or do I have more issues on my hands?
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Old 02-15-2012, 09:17 PM
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Yes, you can have electrical issues that cause transmission issues. When I was setting up my sound system, the truck would act like it was in neutral if I stopped with the music too loud. Get a scan gauge hooked up to it, check the actual voltage and pull the transmission codes. The factory volt gauge is next to worthless.
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Old 02-15-2012, 09:25 PM
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So I bought a 2000 f-350 7.3 six speed a few months ago. The truck ran fine for a wile, then it started to have the hard cold start issue. It would take someo *cranking to start it, then it would start then die. So I start it agian and it runs. Just the other day it started acting that way when I start it when it's warmed up. It died at a stop sign yesterday and it would not start. Towed vehicle home, the next morning I bought a new glow plug relay and installed it. I also checked and added oil to the top res. the truck started. I drove down the street, turned it off, came back out of the market and no start. Rpm gage moves when cranking, shows oil pressure when cranking, and is at about 200 rpm when cranking. So I replaced cps, nothing changed. Came back the next morning put some more oil in the top res, level was about 1" from top. Truck starts. Drove to house, on the way over it cut out while driving twice. Got home held rpm around 2000 , and it would studer randomly. I shut it of and all it will do is crank over. Injectors replaced 20,000 ago. It also would miss when driving in the rain randomly . Help!!!!
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