Detroit Diesel MBE 4000 DDEC VI Troubleshooting Manual page 187

NOTE:
Disconnecting positive power is not sufficient to isolate the CPC for welding purposes.
When welding, the following must be done to avoid damage to
the electronic controls or the engine:
□ Both the positive (+) and negative (-) battery leads must be
disconnected before welding.
□ The welding ground wire must be in close proximity to
welding location - the engine must never be used as a
grounding point.
□ Welding on the engine or engine mounted components is
NEVER recommended.
NOTE:
The alternator should be connected directly to the battery for isolation purposes.
17.3.4 Fuses
A Battery (+) fuse and an ignition circuit fuse must be provided by the vehicle wiring harness.
Blade-type automotive fuses are normally utilized; however, manual or automatic reset circuit
breakers which meet the following requirements are also acceptable. The fuse voltage rating must
be compatible with the CPC – MCM's maximum operating voltage of 16 volts.
To avoid injury from fire, additional loads should not be
placed on existing circuits. Additional loads may blow the
fuse (or trip the circuit breaker) and cause the circuit to
overheat and burn.
All information subject to change without notice.
6SE568 Copyright © PRELIMINARY 2007 DETROIT DIESEL CORPORATION
NOTICE:
FIRE
(Rev. )
MBE 4000 DDEC VI TROUBLESHOOTING GUIDE
17-25