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post #1 of 7 Old 02-15-2014, 07:14 AM Thread Starter
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no sync new FICM

2005 6.0. FICM burned up last week. I have new FICM from FICMfixer. Installed this morning. Monitoring using SCANgaugeII when I cycle the key it shows 42.5 volts which instantly begin to drop. Sync is 0. I replaced the 50 amp fuse in the under hood fuse box. Are there any relays I need to be looking at????????

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post #2 of 7 Old 02-15-2014, 07:29 AM
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Originally Posted by MoneyPit69 View Post
2005 6.0. FICM burned up last week. I have new FICM from FICMfixer. Installed this morning. Monitoring using SCANgaugeII when I cycle the key it shows 42.5 volts which instantly begin to drop. Sync is 0. I replaced the 50 amp fuse in the under hood fuse box. Are there any relays I need to be looking at????????
Pop the hood, take the widow off the FICM and check those readings at the FICM itself.
Have you load tested your batteries? Are you sure the batteries are any good?
If your batteries are good, and your FICM voltage check (at the FICM) shows 42.5..have your rebuilt FICM rebuilt again.
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post #3 of 7 Old 02-15-2014, 08:15 AM Thread Starter
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Thanks for the quick response. The FICM was tested by the rebuilder at 48+ volts on Thursday. I will check at the window. What is odd to me is that the power starts near where it needs to be and immediately drops off. I load tested the batteries this morning. Just to be sure I charged them to 100% and then load to tested them again. They show good. They are almost new batteries (less than 6 months old). Also should KOEO sync be 0 prior to cranking cycle.

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post #4 of 7 Old 02-15-2014, 09:18 AM
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I should have asked this in your other thread, but did you get a rebuilt half-shell, or a full FICM?

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post #5 of 7 Old 02-15-2014, 10:16 AM Thread Starter
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The full FICM was rebuilt

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post #6 of 7 Old 02-15-2014, 10:17 AM Thread Starter
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The full FICM was rebuilt and tested out at 48. I still have my original I was sent a rebuilt unit.

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post #7 of 7 Old 02-15-2014, 03:25 PM Thread Starter
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Finally got it figured out. Put the 50A FICM fuse in the wrong slot. As a future reference if any of you do that, you will see about 40 volts on a Scangage and it will quickly drop to 0. Run like a top now.

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