I am not having power from the fuse box to the battery.
SOURCE: location of fuse boxes for 96 mercedes s-420
there are several fuse boxes. what isn't working. there is 1 on passanger side of the trunk. one in front of the brake master cyl. in the engine compartment and I beleive there is one on the l side of the dash behhind the plastic cover. there is also an overvoltage protection relay under the plastic cover on the right side of engine compartment behond rear firewall. the cover is retained by 4mm allen head bolts or phillips screws
SOURCE: 2003 Jetta TDI alternator light came on in dash
Your voltage regulator supplies the path for the control lead of the alternator and varies the amount of current available to provide the magnetic field of the armature with the required strength.
Measuring from this lead to ground won't show much voltage.
Apparently the regulator is not integrated into the alternator and is probably failed.
If you can chase the control lead backward, you will find the regulator and these are mostly mounted on the fender well or firewall.
SOURCE: location of battery junction box
All ford juntion boxes are under the hood next to the brake booster
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