Electrical - My Interior Dome Light is only ~5V, not the 12v+ (13.6?) it should be, why?

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Old Mar 14, 2006 | 07:06 AM
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Default Electrical - My Interior Dome Light is only ~5V, not the 12v+ (13.6?) it should be, why?

My friend quickly tested my non-lighting dome light and he said (I believe, this was 1 week ago) it was ~5.0v, where it should be ~12v (another thread some one said theres was 13.6v). Why would it be charged (5v) but not fully (12v+)? Old/frayed wire? What else could it be? Car has no other problems that I can detect.

Thank you for your insight.

p3
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Old Mar 14, 2006 | 08:05 AM
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Default Re: Electrical - My Interior Dome Light is only ~5V, not the 12v+ (13.6?) it should be, why? (phoeni

Its 12v, i dont know where you can find 5v into it?

Put the light to on position, put engine running and you should see about 14v there. 13,6v sounds optimal.
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Old Mar 14, 2006 | 11:09 AM
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Default Re: Electrical - My Interior Dome Light is only ~5V, not the 12v+ (13.6?) it should be, why? (phoeni

corroded contacts. unscrew the dome light and try cleaning. also try the door sensor.
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Old Mar 15, 2006 | 05:37 AM
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Default Re: Electrical - My Interior Dome Light is only ~5V, not the 12v+ (13.6?) it should be, why? (phoeni

I cleaned the contacts for the light itself (no luck), but you are saying the housing itself? Haven't tried that.

Also, I get no chirp when I leave the keys in the ignition or open the door with the lights on (car off). Where is/how do I check the door sensor? It's that little L that slides when the door is open/closed, right? The dome light should light if the passenger door is open too, unless both are shot (DS and PS).

Thanks gents.
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Old Mar 15, 2006 | 06:00 AM
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There's one fuse for both the dome light and the door dinger and the seatbelt dinger. Sounds like it is just blown. Try replacing that? Does your clock work? I believe my clock was on the same fuse too.
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Old Mar 15, 2006 | 09:18 AM
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Default Re: Electrical - My Interior Dome Light is only ~5V, not the 12v+ (13.6?) it should be, why? (phoeni

yeah, check the black L shaped things. just clean off the contacts.

yeah, take off the housing. youll see the terminals above it. at least measure your voltage there.
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Old Mar 15, 2006 | 12:06 PM
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Default Re: Electrical - My Interior Dome Light is only ~5V, not the 12v+ (13.6?) it should be, why? (phoeni

purplecrx, I checked all the fuses under the steering wheel with a checker, all good. Is the fuse under the hood?

Will play with this all in a bit.
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Old Mar 15, 2006 | 12:18 PM
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Default Re: Electrical - My Interior Dome Light is only ~5V, not the 12v+ (13.6?) it should be, why? (phoeni

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by phoenix_iii &raquo;</TD></TR><TR><TD CLASS="quote">My friend quickly tested my non-lighting dome light and he said (I believe, this was 1 week ago) it was ~5.0v, where it should be ~12v (another thread some one said theres was 13.6v). Why would it be charged (5v) but not fully (12v+)? Old/frayed wire? What else could it be? Car has no other problems that I can detect.
</TD></TR></TABLE>

you answered your own question.

do this, ground your multimeter to a very clean ground, no paint, then open the door and AT THE LIGHT ITSELF check the strength of the ground by using continuity.

if you have close to 0 resistence at the ground then your door switch is fine.

if you have 5 volts on the power wire check all your fuses, then consider running a new wire.

the only thing that can give you 5 volts is:

1) a half blown fuse

2) a slight break in the wire.

3) your meter is grounded to the same weak ground as the light. but if you follow what i said to do first, youll know the ground is good, so its really only 1 and 2.

thats really all that can cause that.

please post your solution bc it will help others.
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Old Mar 15, 2006 | 04:11 PM
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check the door switch itself. If it is damaged/worn it will make slight contact but not enough to light the dome circuit.
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Old Mar 15, 2006 | 04:24 PM
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Default Re: (NastyHabitzCRX)

Nhabitz, the light on the dash for the door being ajar works, so does that mean my door sensor is 100%?

dthink, I will, but this weekend I may be doing transmission and oil pan gasket so the interrior light bug will have to wait, but I will get to it...
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Old Mar 15, 2006 | 06:20 PM
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Default Re: (phoenix_iii)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by phoenix_iii &raquo;</TD></TR><TR><TD CLASS="quote">Nhabitz, the light on the dash for the door being ajar works, so does that mean my door sensor is 100%?
</TD></TR></TABLE>

the sensor also grounds out the lightbulb directly to the chassis. if the contacts are dirty, itll mess up the potential (voltage).

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