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Freightliner with MB engine low voltage at alternator

B

bccat

Senior Member
Joined
Jun 12, 2010
Messages
311
Location
Langley B C
Occupation
Retired millwright,Heavy Equipment Operator
We have a 2005 freight liner with a MB engine, the alternator output voltage is 1-2volts at idle,the batteries are at 12v. Traced lead from alt to starter still 1-2 v. Should I have battery voltage 12v at alt.It started and ran before we checked voltages and fuses, now it will turn over,but not start. Thanks in advance
 
DMiller

DMiller

Senior Member
Joined
Feb 21, 2010
Messages
16,575
Location
Hermann, Missouri
Occupation
Cheap "old" Geezer
You have to have battery voltage at the back of the alternator large stud or nothing happens. Find the resistance in the wiring and repair it, charge the batteries. By sounds of the cranks fail to restart you have corrosion in or broken wires in a harness.
 
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