alternator plug
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Logistics Pro
Joined: Mar 2007
Posts: 4,583
Likes: 841
From: knoxville, tn
alternator plug
hey guys, my batt. light came on the other day, and I noticed the volts would drop at idle but would come up at higher rpms, so I had my alternator tested, and had my batteries load tested, and all checked out fine, so I started checking connections and found the single plug connection on the alternator was loose and didn't seem to be making a good connection, but I can't seem to find a replacement plug for it, anyone know where to find one?? and could this actually be caused my drop in voltage??
thanks
thanks
Cargo Master
Joined: Jul 2006
Posts: 2,756
Likes: 38
From: Nampa, ID
Short answer, yes, that could cause the voltage drop.
You could try a salvage yard to get one and splice it on to your rig, but that can cause other problems. As long as the plug isn't melted or otherwise damaged, it should be fine.
There was another person with the same issue. Do a search on "voltage drop" or "alternator" and you should find it. His problem turned out to be a bad alternator, but there was talk about a "clip" or something coming loose that holds the plug in securely.
You could try a salvage yard to get one and splice it on to your rig, but that can cause other problems. As long as the plug isn't melted or otherwise damaged, it should be fine.
There was another person with the same issue. Do a search on "voltage drop" or "alternator" and you should find it. His problem turned out to be a bad alternator, but there was talk about a "clip" or something coming loose that holds the plug in securely.
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Logistics Pro
Joined: Mar 2007
Posts: 4,583
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From: knoxville, tn
I was at advance and they said they didn't have a plug for it, looks like I will have to go and look myself, atleast I know it is a likely cause of my voltage problem, and yes I have been guilty of laying on the motor to work on it 
, and it is pretty loose, I can pull it off without having to release the lock-tab from the plug, I hope this fixies my problem, thanks for the help
, and it is pretty loose, I can pull it off without having to release the lock-tab from the plug, I hope this fixies my problem, thanks for the help
Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
you can try to tighten the connector pins/sockets, the most likely cause of the problem.
The dealer has them for sure but they are very proud of their stuff, last one i bought for a 5.4 triton coil was $23, had to do it, no one else had one.
The dealer has them for sure but they are very proud of their stuff, last one i bought for a 5.4 triton coil was $23, had to do it, no one else had one.
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Logistics Pro
Joined: Mar 2007
Posts: 4,583
Likes: 841
From: knoxville, tn
just out of curiosity, what does the single pin plug do?? the wire form the connector only goes to one of the wires on the three wire connector on top of the alternator, is it part of the voltage regulator??
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Logistics Pro
Joined: Mar 2007
Posts: 4,583
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From: knoxville, tn
well it looks like I found my problem, I was checking my connections last night and low and behold I found the bracket that is supposed to be mounted to the gpr relay post that holds one of the coolant lines was leaning against the alternator, and it sparked when I accidently bumped it 
, apparently when we changed my gpr to a stancor we forgot to re-attached the bracket, and ever since then no more battery light or voltage drops, it's amazing how that works
thanks again for all the help
, apparently when we changed my gpr to a stancor we forgot to re-attached the bracket, and ever since then no more battery light or voltage drops, it's amazing how that works thanks again for all the help
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Fleet Mechanic
Joined: Aug 2007
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From: The boonies by Dallas OR
Originally Posted by 97-psd
just out of curiosity, what does the single pin plug do?? the wire form the connector only goes to one of the wires on the three wire connector on top of the alternator, is it part of the voltage regulator??
The three wire plug goes into the regulator. The gray housing below the plug is the regulator itslef. The regulator bolts directly to the brush holder for the field connection
The stator wire is used to tell the regulator that the alternator is spinning. If full 12V is applied to the field wihtout spinning the alternator, the rotor winding will burn up do to lack of cooling air from the fan. So the regulator won't apply full field until the alternator "picks up."
When the key is turned on, current from the ignition goes through the warning lamp to the regulator. This wakes the regulator. The regulator grounds the lamp circuit turning the light on. It also puts a low current through the field winding. The current is low enough it won't hurt the rotor if it's left on indefinetly. When the engine starts, an AC voltage will appear on the stator wire. This enables the regulator and it will go ahead and turn on full voltage to the field. It also turns off the idiot light feed.
Senior User
Joined: Nov 2009
Posts: 144
Likes: 0
From: Western PA
This is probably the one you are talking about.
Ford Alternator and A/C Clutch Repair Connector - The Repair Connector Store
Ford Alternator and A/C Clutch Repair Connector - The Repair Connector Store
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