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Ford Truck Club Forum > FORD F-100 | F-150 SERIES > 1992-1996 Ford F150



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  #1  
Old July 12th, 2012, 12:13 AM
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Default do i need a new alternator?

The last week i have noticed my volt gauge acting a little weird. When i drive without the hvac fan running the needle sits between the R and M in normal. When i use the fan it sits between the N and O and it doesnt fluctuate with more engine rpm. The pics are a little deceiving, they were shot at an angle.

Fan off


Fan on



1994 F150 XLT ExCab SB 306, 4R70w, 8.8 3.55 open, MSD StreetFire coil, Taylor Siro Pro wires, MSD cap and rotor, 1.72 Roller Rockers, 2º cam advance w/ Cloyes Street True Roller timing set, Flat top Hyperutectic pistons, Flowtech Long Tube headers, Xpipe, High flow Magnaflow converters, Spintech XL Sportsman DIDO muffler.

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Old July 12th, 2012, 12:32 AM
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I'd test it with a multi-meter when you have the fan on vs. off, check at the battery to see how much amp's the alt is cranking out.
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Old July 12th, 2012, 12:40 AM
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Will do. Thanks. I'll let you know what i find.



1994 F150 XLT ExCab SB 306, 4R70w, 8.8 3.55 open, MSD StreetFire coil, Taylor Siro Pro wires, MSD cap and rotor, 1.72 Roller Rockers, 2º cam advance w/ Cloyes Street True Roller timing set, Flat top Hyperutectic pistons, Flowtech Long Tube headers, Xpipe, High flow Magnaflow converters, Spintech XL Sportsman DIDO muffler.

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Old July 12th, 2012, 12:42 AM
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oh and holy big sig pic
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Old July 12th, 2012, 10:54 PM
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Today i drove it to Alba, MO and back (40 miles RT) to get a guitar for a buddy of mine and i had no issues with charging at all in fact it may have been over charging a tad bit. The needle sat in between the M and A the entire time. Im still going to purchase a new alternator in the near future, this one just bugs me a little. I tried putting a multi meter on it but the battery it was dead. I have an old Sears engine analyzer i put on it and everything looked ok. For a second opinion i had O'Rielly's test it and they said it seemed fine.



1994 F150 XLT ExCab SB 306, 4R70w, 8.8 3.55 open, MSD StreetFire coil, Taylor Siro Pro wires, MSD cap and rotor, 1.72 Roller Rockers, 2º cam advance w/ Cloyes Street True Roller timing set, Flat top Hyperutectic pistons, Flowtech Long Tube headers, Xpipe, High flow Magnaflow converters, Spintech XL Sportsman DIDO muffler.

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Old July 13th, 2012, 09:24 AM
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At idle it should be 14.4volt +\- 10%, if you are going to get a new alternator, upgrade to a 130 AMP 3G. You should have a 3G already, but it's most likely a 95 amp.


89 F-150 5.0l AOD 2x4, 3.55 LS(+4), Converted to HO Roller, 3g Alt, GT40Ps, Y-pipe, Rerouted PCV, Dual Taurus E-fans, Explorer Injectors, Remote ICM, DIY Cold air, Rubber Vacuum System, Tranny cooler, Remote Tranny filter, Saginaw P\S swap, F350 Brakes, more.


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Old July 13th, 2012, 12:51 PM
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2 hole's on the front, it's a 130A. 4 hole's on the front, it's a 95A.



My money is with Booba, it's a 95A even though the truck is an XLT. That 130A you'll really love!
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Old July 13th, 2012, 01:04 PM
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I planned on getting a 130a and an Optima Battery. Which is better, red top or yellow top. Isn't the yellowa top a deep cycle?



1994 F150 XLT ExCab SB 306, 4R70w, 8.8 3.55 open, MSD StreetFire coil, Taylor Siro Pro wires, MSD cap and rotor, 1.72 Roller Rockers, 2º cam advance w/ Cloyes Street True Roller timing set, Flat top Hyperutectic pistons, Flowtech Long Tube headers, Xpipe, High flow Magnaflow converters, Spintech XL Sportsman DIDO muffler.

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Old July 13th, 2012, 01:18 PM
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There's been some debate about the new Optima batteries, they are made by the same company that makes Walmart's Everstart batteries, Johnson Co IIRC. Quality is supposed to be down, but I'd really love an Optima myself, I think Red top is just regular starting and the Yellow top is Deep cycle.
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Old July 16th, 2012, 11:37 PM
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Neither AZ or O'reilly's carry a 130A alt. Does the 130A maybe come on a F250/350? I really hesitate to buy anything online if i can get it town. It's been my experience that what ever I save on the part, i end up paying in shipping.



1994 F150 XLT ExCab SB 306, 4R70w, 8.8 3.55 open, MSD StreetFire coil, Taylor Siro Pro wires, MSD cap and rotor, 1.72 Roller Rockers, 2º cam advance w/ Cloyes Street True Roller timing set, Flat top Hyperutectic pistons, Flowtech Long Tube headers, Xpipe, High flow Magnaflow converters, Spintech XL Sportsman DIDO muffler.



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