I purchased my H3 used with 14,000 miles on it and have kept up with the maintenance until a few years ago. When I started driving a company vehicle, the H3 was parked and seldom driven for the last 5 years. Recently I was wanting to start driving the vehicle again and suddenly started having issues. First, the battery was consistently draining power and also overflowing, causing an enormous amount of corrosion on and around the fuse panel. After removing the battery, I removed all of the surrounding components and thoroughly cleaned and painted the area. The Fuse Panel was completely disassembled and cleaned as well as checked for any damaged or corroded areas in the circuits. After reassembling the fuse panel and installing a new battery, the vehicle had a no crank, no start symptom. Afterwards, the following has been completed:

• Reset the pass lock system
  • Vehicle cranks, no start
• Check all Fuses & Relays
  • Replaced Fuel Pump Fuse
  • All others are good
• Replace Fuel Pump
• Replace (5) Ignition Coils
• Replace (5) Spark Plugs
• Replace Starter
  • The starter is where the ground was bad and originally draining the battery.
• Replaced the Intake Camshaft Sensor
  • OBD Reader Code
• Replaced the Camshaft Sensor
  • OBD Reader Code

I checked the fuel pressure at the throttle body and found there to be no pressure. After rechecking the ground to the fuel pump, I decided to check the power supply voltage and found there is no power to the fuel pump. My next step is the Powertrain Control Module, unless I'm missing a step.

Any comments would be appreciated.

 

 

See here: https://www.hummerforums.com/forum/h...se-help-40185/

There's a few YouTube's out there about how to reconnect the H3 fuse box without causing problems. Here's one: