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Old 02-08-2013, 08:41 AM
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vids of my 6.0 starting up

Been taking some vids in the morning of my truck starting up in north tahoe area after NOT being plugged in. Temps got to between 7-16degrees the night before the first three vids and on only one vid had it sat for 2 nights before starting. The last video is of it starting after being in the south bay area, maybe 40degrees. The batteries and bpd ficm are brand spanking new, 2 weeks on both. Motorcraft 850cca.

Just looking for some observations from you guys. Do you think the alternator isnt doing its job and do you think the starter is tired?





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Old 02-08-2013, 09:01 AM
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normal during the glowplug cycle IMHO at least thats how mine has always been even with new batts and a hi output alt ,, it has always done exactly what yours has done since the day I started monitoring it

try this wait longer into 2 minute GP cycle after you Key On before you start it the voltage will jump sooner and it will likely start faster with the cylinder temps being higher while not necessary i just feel better LOL

Last edited by ZMANN; 02-08-2013 at 09:05 AM.
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Old 02-08-2013, 09:04 AM
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Re: vids of my 6.0 starting up

Ok Ill try that also, I waited for what felt like a couple minutes once to see if V would bump up but must not have been long enough.

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Old 02-09-2013, 05:42 AM
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mine is about the same with good batteries and good alt (stock). seems pretty normal in cold ambient temps
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Old 02-09-2013, 05:47 AM
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seems normal
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Old 02-09-2013, 06:05 AM
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Looks normal to me.
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Old 02-09-2013, 06:17 AM
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Perfectly normal. The 6.0 ECM wont activate the charging circuit until the GPs are done cycling
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Old 02-09-2013, 07:20 AM
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Re: vids of my 6.0 starting up

Sweet, thanks guys.
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Old 02-10-2013, 08:04 PM
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Quote:
Originally Posted by Dave View Post
Perfectly normal. The 6.0 ECM wont activate the charging circuit until the GPs are done cycling
That's not correct.

The alternator is putting out as much as it can as soon as you fire it up.

The alternator is pretty much in current limiting trying to recover from the drain of cranking plus the 80A is it trying to supply to the glow plugs for the first couple minutes.

When the glow plugs cycle off, you will see the battery voltage start to rise as all that current can be used to recharge the batteries (and the battery voltages rises as they top off).

There is a video floating around on the Youtubes showing the alternator field voltage and alternator output during the starting cycle. Or, stick a clamp on DC ammeter on your alternator output wire and you'll see it putting out lots of amps as soon as the engine starts.

My old half-broken small case alternator was putting out 75-80A right after starting... my new large case 200A alternator puts out 110A under the same conditions. Might even get more out of it once I double up the charge wire.


Lee
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