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rheostat interior light switch, 74 AMX

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304-dude View Drop Down
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Joined: Sep/29/2008
Location: Central Illinoi
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 304-dude Quote  Post ReplyReply Direct Link To This Post Posted: Apr/15/2019 at 4:42pm
Door switches create a ground path to allow dome and courtesy lights to turn on.

If dome light stays on, a ground is happening from the wiring harness somewhere.

Usually a pinch or broken insulation making contact with metal. Most of grounding issues are around the instrument panel frame.

Though you can try unplugging the dome and instrument panel switch harness to see if the problem is with the switch. If the dome light turns off with the connection removed, i would measure resistance between the terminals with the switch in the off position. If the resistance is equal to open circuit between the terminals, i would check and follow along the wiring from the connector to verify nothing is improperly grounding.

71 Javelin SST body
390 69 crank, 70 block & heads
NASCAR SB2 rods & pistons
78 Jeep TH400 w/ 2.76 Low
50/50 Ford-AMC Suspension
79 F150 rear & 8.8 axles
Ford Racing 3.25 gears & 9" /w Detroit locker
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