79 ignition/charging system help
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Freshman User
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79 ignition/charging system help
i have a 1979 f350 with a 351m i eliminated the old solenoid for the snow plow and now my truck dosent charge my friend told me to check the voltage regulator but the truck has a new 200 heavy duty alternator and isnt the regulator integrated i already bought 2 new gel cell batteries and had the new alternator tested any ideas?
Postmaster
Joined: Apr 2000
Posts: 2,838
Likes: 6
From: SD
This sounds interesting... Got few questions to help narrow this down.
1. Does it still have the factory starter solinoid by the battery?
2. Does everthing else still work - radio, wipers, lights?
3. The factory regulator would be a 3"x3" box mounted between the battery and radiator or next to the starter solinoid on the inner fender - do you have one?
4. Is it a factory alternator, or did you swap it on from a different vehicle?
5. How many wires are on the back of the alternator? -can you post a pic?
6. The large one should be hot all the time, is it?
Marty
1. Does it still have the factory starter solinoid by the battery?
2. Does everthing else still work - radio, wipers, lights?
3. The factory regulator would be a 3"x3" box mounted between the battery and radiator or next to the starter solinoid on the inner fender - do you have one?
4. Is it a factory alternator, or did you swap it on from a different vehicle?
5. How many wires are on the back of the alternator? -can you post a pic?
6. The large one should be hot all the time, is it?
Marty
Lead Driver
Joined: Sep 2003
Posts: 5,844
Likes: 6
From: Albuquerque
Is the new 200 amp alternator a "single" one wire hook-up? If so, you need to un-plug the factory regulator. Tape up the factory plug harness and check the charging process again. This is all said without knowing what brand alternator you are using. My PowerMaster 100 amp alternator had that procedure.
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yes it does have a factory solenoid, mylights wipers .......evrything works,
is the regulator the box with several wires running to it next to the solenoid?if yes then i do have one but ive got some rotted wires.
the alternator is a factory replacement with three terminals on the back.
theres a black wire with a red stripe that stays hot .
im told its a mean green 200 heavy duty alternator
is the regulator the box with several wires running to it next to the solenoid?if yes then i do have one but ive got some rotted wires.
the alternator is a factory replacement with three terminals on the back.
theres a black wire with a red stripe that stays hot .
im told its a mean green 200 heavy duty alternator
Posting Guru
Joined: Jun 1999
Posts: 1,172
Likes: 2
From: SW Missouri
if its a factory replacement, the regulator is on the core support near the battery. unplug the harness, and using a wire jump between the batt and the field terminals, that will full field the alternator, using a voltmeter, you should see a big jump in voltage at the battery or alternator output terminal.if it does charge when full fielded, then the regulator is bad, if nothing happens, then the alternator is bad.
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