wiccantoy
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that is correct. the same as my f450 duallyThe alternator lights come on when the key is turned on but then go off again before the truck is running?
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that is correct. the same as my f450 duallyThe alternator lights come on when the key is turned on but then go off again before the truck is running?
Can you define where and color of the wire in question? And the best way to test it?? Not sure whats tickle wire isHave you checked the "tickle" wires going to the alternator in question? These alternators will not charge without a hot tickle wire.
The black and red wires that are coupled together in the flat plug that plugs into the back corner of the alternator. Should be getting 12 volts across them with the ignition switch in the run position.
The exciter circuit passes through the lights. They should not go off until the alternators are producing electricity in a stock system. If they go off before the engine is running something is wrong.that is correct. the same as my f450 dually
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Visit the CUCV Wiki page and download the Tech Manuals that are listed
Cucv Wiki - Steel Soldiers::Military Vehicles Supersite
From your description your GEN1 is not working. With the key on and engine not running, both idiot lights must be working for the alternators to work. They are part of the excitor circuit.
When testing the alterernator wiring on a stock system you should have the following
GEN1
large red wire - battery voltage from the front battery via the 12v terminal block
small red wire on 2plug - battery voltage from the 12v terminal block at all times
small brown wire on 2plug - battery voltage when key is in run position
large black wire - ground from engine block to alt case ****** This is probably your problem ******
small black wire w/white stripe - ground for STE/ICE diagnostic system
small brown push on wire - tach for STE/ICE diagnostic
GEN2
large red wire - 24v from both batteries via the 24v Positive terminal block
small red wire on 2plug - 24v from both batteries via the 24v Positive terminal block at all times
small brown wire on 2plug - 24v via the GEN2 relay when key is in run position
large red wire w/white stripe - 12v feed from 12v terminal block
small orange wire - ground for STE/ICE diagnostic system
small black wire w/capacitor - removed on most trucks
The CUCVs run most of the truck off of GEN1 which is on the drivers side and the front battery. The starting system, glowplugs and the diagnostic system run on both batteries and GEN2 which is the passenger alternator and feeds the back battery.
Check and clean the 2plug connector on the alternator and replace it if necassary. Also check the black ground wire on GEN1.
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