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rheostat interior light switch, 74 AMX

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304-dude View Drop Down
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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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Post Options Post Options   Thanks (0) Thanks(0)   Quote DellyRosen Quote  Post ReplyReply Direct Link To This Post Posted: Apr/06/2021 at 10:28am
Hi....the water siphon has a similar 12 volt hot side feed that the lights have most the time. In the event that you run a second feed for the lights or siphon the dimmer will turn out great. Not certain why , but rather most these produces run one hot feed to control the lights and siphon. At the point when the siphon runs the dimmer lights gleams without fail. I have seen post on different gatherings that had the very issue and running that new feed fixed the issue.




Edited by DellyRosen - Apr/29/2021 at 11:23am
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304-dude View Drop Down
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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/06/2021 at 11:33am
Originally posted by DellyRosen DellyRosen wrote:

Hi....the water siphon has a similar 12 volt hot side feed that the lights have most the time. In the event that you run a second feed for the lights or siphon the dimmer will turn out great. Not certain why , but rather most these produces run one hot feed to control the lights and siphon. At the point when the siphon runs the dimmer lights gleams without fail. I have seen post on different gatherings that had the very issue and running that new feed fixed the issue.


From past issues on Javelin grounds... there is a wee ground to the instument panel. Since the frame is plastic and isolated from grouND if that ground is missing, some of the instrument lights fail to function. Haven't looked at all the switch grounds since rewiring, but electric washer is isolated, not grounded, since the only feed is power to the motor. Wiper circuit is isolated at the panel, and uses ground strap at the motor. Unless it's not a Humpster Javelin, then the wiper switch has a ground. Lights share a ground which also is part of the instrument panel. That's all I can think of on the top of my head.

The wee wire that attaches to the metal frame of the light assembly is the most overlooked ground wire, when someone is replacing dash assembly and it's components on Humpsters. The grounding strap to the wiper switch is as overlooked on other bodies.
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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