79 ignition/charging system help
Thread Starter
|
Freshman User
Joined: Nov 2004
Posts: 37
Likes: 0
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: 5
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.
Please post back...
Please post back...
Thread Starter
|
Freshman User
Joined: Nov 2004
Posts: 37
Likes: 0
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.
Trending Topics
New User
Joined: Jan 2008
Posts: 0
Likes: 24
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote