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55/56 Dodge/Plymouth Dome light wiring
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56D500boy
Posted 2018-06-08 8:22 PM (#564853)
Subject: 55/56 Dodge/Plymouth Dome light wiring



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I stupidly removed my dome light many months (maybe a year) ago without marking anything wiring-wise. Now I have a NOS dome light base that I want to install and I realize that I don't quite understand how the switch works. When I had my 1955 Dodge (Plodge) the dome light was the same (I think), and I thought I could turn the dome light on at anytime with the switch (and leave it on and flatten the battery LOL). From what I understand of the wiring diagram, the switch is used to create a ground, i.e. there is 12V coming in hot to the dome light at all times, it is just when a door switch is open that a ground is completed and the light comes on. The wiring diagrams are confusing IF I thought that I could turn the switch on with the doors closed and get a light. Help an old guy and straighten me out.

Red seems to be the hot in and yellow the grounding circuit via the door switches.



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56D500boy
Posted 2018-06-08 8:42 PM (#564855 - in reply to #564853)
Subject: RE: 55/56 Dodge/Plymouth Dome light wiring



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Location: Lower Mainland BC
Okay. I took the old dome light base switch apart. I believe that the switch is a sliding copper bar with two "bumps" fit in detents that creates a grounding circuit between a jumper wire from the door switch ground circuit wire on the bulb socket and and the car body via the dome light base mounting screws.

I think.
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56D500boy
Posted 2018-06-08 10:34 PM (#564858 - in reply to #564855)
Subject: RE: 55/56 Dodge/Plymouth Dome light wiring



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One of the reasons that I was having problems figuring out how the dome light switch works is apparently that the sliding copper bar and/or the contact points that complete the ground circuit when the switch is turned to "ON" are corroded and I wasn't getting continuity with my Ohm meter. After sliding the switch ON/OFF a few times, I got continuity and it became clear how the switch works: ON = bulb is grounded, OFF = bulb is not grounded.

While I was there, I checked continuity across the two wire connections and the bulb contacts. They are fine. (But I might clean them up a bit anyway).

Little by little.



Edited by 56D500boy 2018-06-08 10:35 PM
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lozrox58
Posted 2018-06-09 8:06 AM (#564870 - in reply to #564853)
Subject: Re: 55/56 Dodge/Plymouth Dome light wiring



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Power to the light comes from the light switch (red wire) but it is live all the time.
Ground for the light comes from the manual switch, or the door switch (yellow wire)
The dome light switch does ground thru the mounting screws. It is possible to turn the courtesy light on with the doors closed (and flatten the battery)
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56D500boy
Posted 2018-06-09 2:05 PM (#564884 - in reply to #564870)
Subject: Re: 55/56 Dodge/Plymouth Dome light wiring



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Location: Lower Mainland BC
lozrox58 - 2018-06-09 8:06 AM

Power to the light comes from the light switch (red wire) but it is live all the time.
Ground for the light comes from the manual switch, or the door switch (yellow wire)
The dome light switch does ground thru the mounting screws. It is possible to turn the courtesy light on with the doors closed (and flatten the battery)


Thanks. That confirms what I was thinking yesterday.

Today I remembered that I had save eBay photos of a 56 Dodge headlight switch, with wires, so I put this together (not 100% sorted, I am not good on those cloth covered wires - can't tell what they are supposed to be):



(55-56DodgeHeadlightSwitchShowingWires_Annotated_3.jpg)



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Attachments 55-56DodgeHeadlightSwitchShowingWires_Annotated_3.jpg (154KB - 21 downloads)
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