Series Coil Open Test

1993 Cadillac Eldorado Base, 4.6 YSECTION Series Coil Open Test

Using self-powered test light, place one lead on series coil terminal connection and other lead on insulated brush. See Fig 1 . If test light fails to illuminate, series coil is open and requires repair or replacement. Repeat test for each insulated brush.

Fig 1: Testing Series Coil For Open
G90A04569Courtesy of GENERAL MOTORS CORP.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.