1. Battery voltage 11 - 14 V. 2. Check fuses. 3. Systems and fluid levels in order. Note: To prevent damage to the control modules refered to in 23 and 24 , the connectors on the control modules must only be removed or installed with the ignition OFF . Electrical wiring diagrams: See Electric Troubleshooting Manual, Model 129, Volume 1.

Conventional tools, test equipment

Description	Brand, model, etc.
Multimeter 1)	Fluke models 23, 83, 85, 87
Signal generator 1)	SUN DTR-8416

1) Available through the MBUSA Standard Equipment Program.