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1986 RX 7 Dome and Trunk Lights Issue

Old Apr 2, 2015 | 04:37 PM
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From: Rancho Cucamonga
1986 RX 7 Dome and Trunk Lights Issue

What would cause these 4 bulbs to not have electricity?
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Old Apr 2, 2015 | 06:31 PM
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From: tulsa,ok.
Blown room fuse?
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Old Apr 2, 2015 | 07:08 PM
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Could also be a bad ground(s). Have you check the bulbs to make sure they're good (with a volt meter)? Have you checked the sockets to see if they have power?
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Old Apr 4, 2015 | 08:31 AM
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From: Rancho Cucamonga
Originally Posted by JamesBond000
What would cause these 4 bulbs to not have electricity?
Also of note i rechecked and i noticed that they must have a current but... when you press the dome light buttons in the hatch warning light goes on :P so now i am at a loss
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Old Apr 4, 2015 | 01:51 PM
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Originally Posted by JamesBond000
Also of note i rechecked and i noticed that they must have a current but... when you press the dome light buttons in the hatch warning light goes on :P so now i am at a loss
Does the hatch warning light come on after pressing the dome light w/no key in the ignition (in other words, w/the key not turned to the on position) or is the key turned to on?
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Old Apr 6, 2015 | 04:50 PM
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Originally Posted by satch
Does the hatch warning light come on after pressing the dome light w/no key in the ignition (in other words, w/the key not turned to the on position) or is the key turned to on?
Both sir when vehicle is off no key and when key in on and bonus when car is turned on lol
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Old Apr 6, 2015 | 05:17 PM
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From: tulsa,ok.
Originally Posted by JamesBond000
Both sir when vehicle is off no key and when key in on and bonus when car is turned on lol
The meter fuse provides power to the warning light unit thus w/key to on the lights receive voltage but what prevents them from turning on is a ground signal. Thus the lights can only be activated if the B/Y wire from the meter fuse is powered and the bulb also has a ground. What this means is if any of the lights turn on when the ignition is not turned to on suggests something else is powering the warning lights besides a fuse that only has power w/key to on and this is wrong.

One thing you could do is pull the meter fuse and see if any of the warning lights can be activated as before. You could also see if the B/Y wire has power when the key is not set to the on position. And the specific wire which provides a ground to the warning light when the hatch is open is Green in color.
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Old Apr 6, 2015 | 05:53 PM
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From: Rancho Cucamonga
Originally Posted by satch
The meter fuse provides power to the warning light unit thus w/key to on the lights receive voltage but what prevents them from turning on is a ground signal. Thus the lights can only be activated if the B/Y wire from the meter fuse is powered and the bulb also has a ground. What this means is if any of the lights turn on when the ignition is not turned to on suggests something else is powering the warning lights besides a fuse that only has power w/key to on and this is wrong.

One thing you could do is pull the meter fuse and see if any of the warning lights can be activated as before. You could also see if the B/Y wire has power when the key is not set to the on position. And the specific wire which provides a ground to the warning light when the hatch is open is Green in color.
oh gawd gotta call my one friend to much b to the y and meters and fuses lol ill try to watch him do it so i have a better understanding for sure though. Thanks for the info
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Old Apr 6, 2015 | 07:21 PM
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Originally Posted by JamesBond000
oh gawd gotta call my one friend to much b to the y and meters and fuses lol ill try to watch him do it so i have a better understanding for sure though. Thanks for the info
Prefer some T&A instead?

Okay, let's break it down a bit. Power comes from the battery positive terminal through the fuse box. In the under-dash fuse box, there's one fuse labeled "METER", it supplies power to the light through a Black wire with a Yellow stripe (B/Y in the shop manual's lingo as Satch mentioned). Here's a quick ascii diagram to spell it out better:

Battery + ------Meter Fuse -------Dome Light-----Switch-----Ground on Chassis (goes to Battery Negative)

This is called "Ground Switched", in that only when the switch is ON will it complete the circuit and turn the light on. Most of the stuff in our cars are ground switched like this.
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Old Apr 9, 2015 | 04:05 PM
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From: Rancho Cucamonga
Originally Posted by Akagis_white_comet
Prefer some T&A instead?

Okay, let's break it down a bit. Power comes from the battery positive terminal through the fuse box. In the under-dash fuse box, there's one fuse labeled "METER", it supplies power to the light through a Black wire with a Yellow stripe (B/Y in the shop manual's lingo as Satch mentioned). Here's a quick ascii diagram to spell it out better:

Battery + ------Meter Fuse -------Dome Light-----Switch-----Ground on Chassis (goes to Battery Negative)

This is called "Ground Switched", in that only when the switch is ON will it complete the circuit and turn the light on. Most of the stuff in our cars are ground switched like this.
Sweeet thank you for the information! now i at least have more insight towards the matter
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