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Old 03-09-2012, 11:38 AM
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Bad Alternator

Wife just called me with the good news that the alternator on our 06 is bad. I have noticed that the truck has been turning over slower lately.

What affects could a bad alternator have on the motor. It has been running rough the last week. Of course this happens when I am out of town...ha ha
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Old 03-09-2012, 11:49 AM
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If you're lucky you caught it before any problems! Alternator, batteries, FICM and injectors are all tied together by voltage. From what I know (or think I know ) They can all take each other out if one is weak. I just did my FICM, batteries and alternator in a 5 month span. I'm not sure which one went first or if they were even related or just a coincidence but they are all good (read new) now.

Get the batteries load tested and check the FICM voltage, it's free to do both! Welcome the the ORG! Good luck, hope nothing else is wrong with it!
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Old 03-09-2012, 01:43 PM
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just replaced mine yesterday, died in the middle of the day. I repaired my FICM about 3 months ago, batteries about a year ago. Needless to say that she fires right up now and loves the new alternator.
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Old 03-09-2012, 04:11 PM
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I replaced the batteries in Sept of 09. Thought it might be them, wife called AAA for a jump and they told her it was not charging. Will have to get a new alternator when I get back home before checking the batteries.
I have planned to remove the cab next month and bulletproof this thing. Can't find a truck that I would want to replace this one with.
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Old 03-09-2012, 06:47 PM
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just as fishermedic stated. everything is connected somehow. on my 04 i did it wrong and replaced everyting one at a time. on my 05, i monitor things so i dont get to that point hopfully. if one thing goes bad, fix it right away so you dont have to fix something else.

bailey
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Old 03-10-2012, 04:21 AM
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Truck is in the driveway till I get home.

Part store says they have 2 alternators that could go on the 06 F350
one is a 110 and the other is a 135
What is the difference and if I have the 110 can I upgrade to the 135?
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Old 03-10-2012, 05:58 AM
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Quote:
Originally Posted by hogasm View Post
Truck is in the driveway till I get home.

Part store says they have 2 alternators that could go on the 06 F350
one is a 110 and the other is a 135
What is the difference and if I have the 110 can I upgrade to the 135?
I personally would upgrade to an aftermarket high amp alternator. If you had a voltage gauge you would see how under powered the OEM alternator is. Before I replaced mine my voltage right after startup would be around nine volts until the glow plugs would shut off and those kind of voltage swings are incredibly bad for the longevity of your FICM.

http://www.alternatorparts.com/6g-se...lternator.html

https://www.dcpowerinc.com/category/...html?make=Ford

Last edited by Term3; 03-10-2012 at 06:04 AM.
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Old 03-10-2012, 06:35 AM
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i would deffinatly upgrade. a ficm is worth way more than the 200 dollars difference. im also considering the coleman battery minder as recomended by ficm repair.

bailey
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Old 03-10-2012, 06:43 AM
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Low battery voltage puts an enormous stress on the dc-dc convertor (what bumps the voltage from 12 to 48 volts) in the ficm. About half the trucks I put a ficm in get a set of batteries replaced and everyone gets a battery test whether anyone likes it or not.
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Old 03-10-2012, 06:46 AM
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Quote:
Originally Posted by Term3 View Post
I personally would upgrade to an aftermarket high amp alternator. If you had a voltage gauge you would see how under powered the OEM alternator is. Before I replaced mine my voltage right after startup would be around nine volts until the glow plugs would shut off and those kind of voltage swings are incredibly bad for the longevity of your FICM.

6G Series Heavy Duty Bridge Rectifier High Output Alternator

https://www.dcpowerinc.com/category/...html?make=Ford
I thought that the alternator didn't start charging until the glow plugs were off? I may have misread that but that's my understanding. I have the DC Power 185 amp and my voltage is at 10.5 while starting, 11-11.5 right after starting and then up to 13.5-14 after a few seconds, I'm assuming when the plugs are off.

I do agree though, the less of a swing and the healthier the power system the better it is for the truck.
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