New batteries Dead.. HELP!

[pittdiesel]

Hey Guys. I've searched for my symptoms but cannot find anyone with this. This is my first time dealing with electrical. Be gentle.

94 7.3. Two brand new batteries. Glow plug wait light normal. Truck battery meter on dash low Range. Truck cranks. Doesn't fire. Hook up to car to jump fires right up!! Dash guage shoots up to middle range. Had to do this for past two weeks!

Ran for 25 min and drove it. Turned off and cranked back over but it was slower crank and guage was in low range again.

Is this alternator? 210k I think it's the stock one. I don't know anything about glow plug relay as I've read and someone suggested. Don't know how to check. No voltmeter on me.

Only recent work done was lift pump. Batteries disconnected.

Battery charger says both batteries 12.3 and 12.4 volts when doing an alternator Test. How many I need? Need to leave town first thing in morning so I appreciate the quick replies. Also no accessories hooked up.

1. Alternator?
2. When driving battery guage goes up when gassing it. Does that mean alternator not bad? Where should this be when off, when on?

Thanks guys. Sorry so long.




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[madpogue]

When you did the alternator test, was that after the glow plugs had cycled off? (Note: this has NOTHING to do with the WTS light.) If not, that would explain the low voltage. Voltage while the engine is running, after the glow plugs have cycled off, should be about 14.

But that doesn't tell you anything about the batteries. You need to isolate the batteries and LOAD test them.

It also doesn't explain a no-start. What is the cold cranking capacity of the batteries?

[vandy]

For what it's worth....when my truck fires the battery gauge shows low for about 2 min till the Gpr shuts off then at idle i go to about between the M and A from normal.

Grab a volt meter hit the Gpr
When checking the batteries make sure they are NOT connected.
My bet would probably be your alt.

[ZMANN]

Truck cranks. Doesn't fire. Hook up to car to jump fires right up

sounds like batteries to Me
pull them and have them individually load tested

[pittdiesel]

Batteries are 850cca


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[pittdiesel]

I messed up guys. I didn't do an alternator test. I did a test on each battery voltage. They both range 12.5-12.3. Sorry.


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[pittdiesel]

Batteries where my initial thought they were dead. Now Had Walmart one replaced for free. Advanced charged mine full. I also charge full last night after driving. Now it cranks but not enough to get it to turn.

Stranded this morning. No start, slow crank.

No time to jump start had to go to work.

If I hook up to running car man she cranks like brand new and turns over. But I think something's wrong cause it shouldn't do that after I jump, drive it, and then do it all again next day. That's why I felt like they're not charging.



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[sgg93]

I was chasing an electrical problem for weeks that ended up being an internally corroded battery cable. A ground cable at that.

[pittdiesel]

Wow how did you figure it out?


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[351fifty]

Remove your alternator and have it tested, bet that's the issue