GMC SIERRA 6.5L

A large fleet of emergency vehicles examined. All of these vehicles have been subsequently withdrawn from service.

Complaints: 1. overheating engines; 2. engines stopping at random intervals; 3. batteries failing.

Findings: 1. radiator intake opening clogged with emergency lights, sirens, etc.; 2. incorrect wiring arrangement around the Fuel Solenoid Module (ref. attached drawings);

3. batteries faulty when new, batteries incorrectly interconnected, batteries' inadequate capacity, crews unaware of vehicles' limitations.

Note.

1.Revisions proposed to the Module itself (removal of gasket, covers, etc.) are probably not important;

2.Findings not fully verified as the vehicles have been disposed of.