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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Battery AMP light intermittent

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Old May 28, 2022 | 04:36 PM
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Battery AMP light intermittent

Hello

1994 F150 5.0 EFI

I hit a large bump that shock the whole dash and the battery amp light starts to go in and out intermittently. So I pulled over and all connections were tight and secure.

I have replaced the alternator since the old one was black and had some soot. Battery is new, replaced the fusible link that feeds to the alternator.
connections from starter relay are clean as well as battery terminals.
I pulled the instrument cluster and found no loose connections.

Is there another fuse embedded in the wire loom somewhere that may have popped out? Really scratching my head on this one.




Thanks guys.
 
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Old May 29, 2022 | 06:29 PM
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Bump to the top.
 
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Old May 29, 2022 | 09:32 PM
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Have you verified the new alternator works with a multimeter? I've gone through two or three before finding one that actually work worked. I think its the regulator that usually goes bad on them, them they don't seem to rebuild that when the do the rest.
 
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Old May 29, 2022 | 09:50 PM
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The alternator is a NAPA New alternator.

With key on engine off:

Im getting 12v on the connector into the alt reg at both the lg/red wire and white/black wire.

Grounding the terminal stud on alternator gets me 12v

The “F” screw on the regulator gets me 12.77v
”A” screw .08v

Battery at 12v engine off. Is there supposed to be a ground wire coming from the alternator?
 
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Old May 30, 2022 | 07:01 AM
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Is the 12.77 while running?

The alternator should be putting out 14-14.4 ish when running.

The alternator grounds through the block.
 
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Old May 30, 2022 | 08:24 AM
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check the plug on the alternator. have someone wiggle it while you watch the dash. they are known for intermittent contact when older.
if there is any play at all in the plug, and replacement plug should solve the issue.
 
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Old May 30, 2022 | 08:50 AM
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Originally Posted by tjc transport
check the plug on the alternator. have someone wiggle it while you watch the dash. they are known for intermittent contact when older.
if there is any play at all in the plug, and replacement plug should solve the issue.
which plug? There is a black one with three wires and a gray plug with 1 wire.
 
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Old May 30, 2022 | 08:57 AM
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Originally Posted by CalypsoOBS01
which plug? There is a black one with three wires and a gray plug with 1 wire.
I would wiggle both for testing
Dave ----
 
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Old May 30, 2022 | 09:01 AM
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yup. both. a plug is a connection that can become loose and fail over time.
 
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Old May 30, 2022 | 09:03 AM
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Originally Posted by tjc transport
yup. both. a plug is a connection that can become loose and fail over time.
ok Ill check both, the black plug is tight. The grey plug with single wire is very loose when connected.
 
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Old May 30, 2022 | 09:15 AM
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Originally Posted by CalypsoOBS01
ok Ill check both, the black plug is tight. The grey plug with single wire is very loose when connected.
When you wiggled them was the truck running and someone watching the light to see if it came on?
Other wise you will not know if that was the cause of the light or not.
Dave ----
 
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Old May 30, 2022 | 09:36 AM
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Truck was running. Wiggled both connectors and held them in various positions. Battery light still flashes 3 times goes off flashes 3 times again.

Battery at 14.50 volts when running.
 
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Old May 30, 2022 | 09:42 AM
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Sure it is the battery light and not a check engine light?
I never heard of a battery light flashing let alone 3 times then off, and 3 times again?
It is either on all the time or off all the time.

You have a computer maybe hit up one of the parts stores and have them see if there is any stored codes in the computer.
Dave ----
 
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Old May 30, 2022 | 09:55 AM
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Picture taken with key on engine off. So check engine light and battery light on is normal.

To be more clear it is this light circled that flashes. Says AMP on a battery picture.


battery steady at around 14v with lights on radio on engine on.


 
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Old May 30, 2022 | 11:50 AM
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UPDATE

UPDATE

After much electrical diagnosis and research I have concluded I do not have a battery/charging problem.

What initially manifested itself as a battery problem in association with the situation (hitting a large pothole, battery light illuminates) led me to believe that was the issue.

HOWEVER the battery light is incorrect, it is actually an AIRBAG LIGHT, the instrument cluster on my 1994 F150 is an incorrect replacement.

I count a code value of “32” when the light flashes. Horn and cruise do not work even with the TSB applied for the cruise.

https://www.fullsizebronco.com/threads/amp-light.364818/

I will order the clockspring and update you all.

Thanks FTE


 
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