Armature & Field Grounded Circuit Test - Bench Test

1986 Mercury Capri GS, 2.3 A, StandardSECTION Armature & Field Grounded Circuit Test - Bench Test
NOTE: This test will determine if field winding insulation has failed, permitting a conductor to contact the frame or armature core.
  1. Connect negative voltmeter lead to negative battery terminal. Connect positive voltmeter lead to commutator. Connect a jumper wire between positive battery terminal and armature core. If any voltage is indicated, windings are grounded and armature should be replaced.
  2. Connect a jumper wire between negative battery terminal and starter frame. Connect negative voltmeter lead to positive battery terminal. Connect positive voltmeter lead to field coil eyelet terminal. If any voltage is indicated, field windings are grounded and should be replaced.
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.