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strap to chassis ground. Capacitors work best on switch pops and low frequency noise. Filters work best on high frequency whines and static. After adding any suppression device, inspect all of the vehicle systems including those not Whenever possible, make a test harness that includes filters or capacitors. Always inspect If an audible pop is caused due to operating a switch, perform the following repairs as Add a capacitor across the contacts of the switch. Add a capacitor from the battery positive voltage (B+) side of the switch to chassis Add a capacitor from the ground side of the switch to chassis ground. Use the following available noise suppression devices: 220 micro farad (50 V) capacitor GM P/N 1227895-Works well for ignition system 0.47 micro farad capacitor GM P/N 1227894-Works well for switches and relays. Feed through capacitor GM P/N 477371-Works well for high current situations. Filter package GM P/N 1224205-Works well for low current situations. Fuel pump suppressor GM P/N 25027405 21 inch braided ground strap GM P/N 8910791 19 inch braided ground strap GM P/N 6286800 10.5 inch braided ground strap GM P/N 6287160 8.5 inch braided ground strap GM P/N 12091511 Generator Whine Concerns 1. Inspect the ground terminal and cable for high resistance. 2. Inspect the generator and brackets for loose or coated mounting bolts. 3. Inspect that the ground straps between the engine and the frame are clean and tight. IMPORTANT: When installing suppression devices, signal wires such as sensor and communication circuits should not be
2007 Hummer H3 2007 ACCESSORIES AND EQUIPMENT Cellular, Entertainment and Navigation - H3
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