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Old 08-12-2013, 01:39 PM
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Alternator Change Out Before FICM?

Hey Fellas,

My FICM finally cr@pped out. I ordered a new one from FICMrepair along with a new 185 amp DC Power alternator. Ed told me to change out the alternator first before I change out the FICM or it will fry the FICM. I don't understand how if I leave the batteries disconnected until the end of both jobs. Any ideas?

I received the FICM today and would like to get that replaced before the alternator shows up tomorrow. My alternator appears to be putting out low voltage but still in the 12.5v-12.9v range after Glow Plugs kick off.

Does he mean don't do the complete alternator install (hook up the batteries) while the FICM is disconnected? I could see how that may be a problem because someone could hook the batteries back up by accident, then plug in the FICM.

Thanks in advance!
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Old 08-12-2013, 01:56 PM
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Is the existing alternator charging correctly?


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Old 08-12-2013, 01:58 PM
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if your current charging system is fine this includes batteries and cables ETC then it would be ok to swap FICM's

but ED has a required minimum voltage at start up IIRC and it almost exceeds
a new charging systems capabilities from what I recall
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Old 08-12-2013, 01:58 PM
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I think (and I may be wrong) is that he does not want you to run the new FICM on a weak alternator at all. Wait to fire it up when you have the new healthy alternator in.
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Old 08-12-2013, 02:00 PM
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And something I do just for chyt's and giggle is when ever Im working on the truck I throw the batt charger on there just to top off the system. Anything I can do to help the FICM out.
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Old 08-12-2013, 02:00 PM
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ps just wait until tomorrow and do the alt and see if it's up to par then the FICM

this is just the safest way
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Old 08-12-2013, 02:13 PM
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Thanks for the replies! I topped off the batteries last night and they are good to go.

I guess its the "Whatever you do.... don't push the red button..." in me.

I'll wait till tomorrow and let you guys know how it goes.

Thanks for the help! This site rocks!
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Old 08-12-2013, 03:44 PM
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Quote:
Originally Posted by kinnisoj View Post
I think (and I may be wrong) is that he does not want you to run the new FICM on a weak alternator at all. Wait to fire it up when you have the new healthy alternator in.
I think this is exactly right!
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Old 08-12-2013, 03:46 PM
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Originally Posted by Guy_K View Post
Thanks for the replies! I topped off the batteries last night and they are good to go.

I guess its the "Whatever you do.... don't push the red button..." in me.

I'll wait till tomorrow and let you guys know how it goes.

Thanks for the help! This site rocks!
And you will love the DC Power alt. I could swear my truck started running better as soon as I installed mine!
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Old 08-12-2013, 04:11 PM
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Don't forget about steps #13 and #17! FICM Repair.com - Your Source for FICM Repair
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