Dome light not working
#1
Dome light not working
I just replaced the dome light (figure attached)
because it was missing but it doesn't light up. Does anyone know how this light works? Is it supposed to light automatically when you open the door?
Thank you
David.
because it was missing but it doesn't light up. Does anyone know how this light works? Is it supposed to light automatically when you open the door?
Thank you
David.
#2
Last edited by kingkohlmn; 12-14-2015 at 11:21 PM.
#3
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St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
The dome lamp works off the door opening and off the headlamp switch grounding. The lamp is hot waiting for a ground.
You didn't say what year the car is so posting help is kind of hard. What year is the car and I'm sure more help will come.
Willcox
You didn't say what year the car is so posting help is kind of hard. What year is the car and I'm sure more help will come.
Willcox
#4
C3 79 sorry
its a C3 1979 car, sorry didn't mention it.
d.
d.
#5
the fuse?
what you mean by the fuse? the light bulb is totally new. where is the fuse located in a 79 C3?
Thank you
david.
Thank you
david.
Did you check the fuse? Also a very good investment is to purchase the service manual, assembly instruction manual (AIM) and electrical drawings. You can get a copy of the electrical from one of the fourm members. https://www.corvetteforum.com/forums...or-anyone.html
#6
Team Owner
The most likely cause of your dome light issue is the wiring either at the dome or between there and the power or ground side. My first test would be measure for 12v, or use a test light on BOTH sides of the bulb with the lead on the test light grounded. If the voltage is missing, you have either a bad fuse, bad connection at the dome light, or a broken wire. Post back what you find and we can go from there.
#7
Team Owner
You did connect both the power and the ground wires to the new dome ***'y, correct?
#8
followup
the lights underneath the dashboard and glove compartment work when I open the door. this is for sure. I used one of those pens that measure current and when I put it next to the dome light nothing happens as if there is no current. What else I need to measure the 12v? Also, where is this 'fuse' located that you are mentioning?
also, I did not connect any power or ground wires to the new dome. I just got a new light for the dome and place it and that when I found out it doesnt light up. I just got the c3 a month ago and I am going through everything that doesn't work...
can you specify what ground wires I have to connect to the new dome?
Thank you a lot
david.
also, I did not connect any power or ground wires to the new dome. I just got a new light for the dome and place it and that when I found out it doesnt light up. I just got the c3 a month ago and I am going through everything that doesn't work...
can you specify what ground wires I have to connect to the new dome?
Thank you a lot
david.
All it takes is 12v and a ground. The 12v is on the bulb at all times. Use a voltmeter and measure on both sides of the bulb for 12v (put the black lead on a known ground (frame, engine, negative post of battery, etc) If voltage is there you have a ground issue. When you open either door, the door switch provides a ground to the courtesy lights and the dome. Do the courtesy lights work? If so, the door switch is fine.
The most likely cause of your dome light issue is the wiring either at the dome or between there and the power or ground side. My first test would be measure for 12v, or use a test light on BOTH sides of the bulb with the lead on the test light grounded. If the voltage is missing, you have either a bad fuse, bad connection at the dome light, or a broken wire. Post back what you find and we can go from there.
The most likely cause of your dome light issue is the wiring either at the dome or between there and the power or ground side. My first test would be measure for 12v, or use a test light on BOTH sides of the bulb with the lead on the test light grounded. If the voltage is missing, you have either a bad fuse, bad connection at the dome light, or a broken wire. Post back what you find and we can go from there.
Last edited by siol; 12-15-2015 at 10:37 AM.
#9
Team Owner
OK, so you only replaced the lamp. I'd take the two screws out and drop it down and see if it has two wires connected to it. They may have been disconnected.
#10
#12
Melting Slicks
Do you have an owner's manual? it is in section #6, lists the bulbs, fuses, etc.
The 20 amp fuse handles the clock, lighter, courtesy, anti-theft alarm, glove box, & dome. Right under the circuit breaker on the top left but as stated if those work then it is something else.
The 20 amp fuse handles the clock, lighter, courtesy, anti-theft alarm, glove box, & dome. Right under the circuit breaker on the top left but as stated if those work then it is something else.
#13
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#14
Team Owner
Forget the fuse if your courtesy lights work. Go back to what I told you about the connections at the dome.
#15
I just did that and both wires are connected. I checked the current using one of those pens that bip when voltage is live but nothing. So there seems to be NO current going through the wires. The problem might be somewhere else and I have no idea where to start...
#16
Team Owner
I'm dropping out here until (unless) you measure with a voltmeter for 12v on both sides of the lamp with the negative meter lead on a KNOWN good chassis ground and report back what you get.
#17
wow, im sorry if I offended you. I dont have the 12v, is this below what I need to measure it?
thank you
http://www.delcity.net/store/12-Volt...FQMMaQodBd0HLw
thank you
http://www.delcity.net/store/12-Volt...FQMMaQodBd0HLw
#18
Team Owner
wow, im sorry if I offended you. I dont have the 12v, is this below what I need to measure it?
thank you
http://www.delcity.net/store/12-Volt...FQMMaQodBd0HLw
thank you
http://www.delcity.net/store/12-Volt...FQMMaQodBd0HLw
That meter you showed will probably work, but you can buy one for $7 at harbor freight that will read ac and dc voltage, resistance, and current. Sometimes they even have it for free with any purchase. You don't need a meter specific to car voltages. Once you fix this problem you will still have the meter to check continuity, voltages, etc.
#19
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St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
When testing for power at the dome lamp bulb, the orange wire to your lamp is the power wire, the white wire is the ground. At no time should the white wire have 12 volts present.
The white wire ground breaks off to each of the door jamb switches and the headlamp switch and this allows the lamp bulb to receive proper ground when you open the door or turn the headlamp switch to the dome/courtesy lamp position.
Basic schematic
Delay timer schematic
Full schematic.
The white wire ground breaks off to each of the door jamb switches and the headlamp switch and this allows the lamp bulb to receive proper ground when you open the door or turn the headlamp switch to the dome/courtesy lamp position.
Basic schematic
Delay timer schematic
Full schematic.
Last edited by Willcox Corvette; 12-17-2015 at 06:30 AM.
#20
Team Owner
When testing for power at the dome lamp bulb, the orange wire to your lamp is the power wire, the white wire is the ground. At no time should the white wire have 12 volts present.
The white wire ground breaks off to each of the door jamb switches and the headlamp switch and this allows the lamp bulb to receive proper ground when you open the door or turn the headlamp switch to the dome/courtesy lamp position.
Basic schematic
Delay timer schematic
Full schematic.
The white wire ground breaks off to each of the door jamb switches and the headlamp switch and this allows the lamp bulb to receive proper ground when you open the door or turn the headlamp switch to the dome/courtesy lamp position.
Basic schematic
Delay timer schematic
Full schematic.
The white wire will also have 12v with the bulb in place when the door switch nor headlight switch is grounded. Once either switch grounds the white wire, the 12v is dropped across the bulb and the white wire will no longer read 12v. I asked him to read for 12v on both sides of the bulb (should be done with the doors closed and the courtesy lights off) just to check the bulb he put in. My bet is that he has no 12v on the orange wire to begin with, but I'm having a hard time getting that info. A "current sensor" won't read current unless the current is flowing, but the voltage will read with a voltmeter.
Last edited by 65GGvert; 12-17-2015 at 07:11 AM.