Anyone know what voltage is suposed to come into the dome light on the rearview im getting a reading of 1.5 volts ...also what type of bulb do you need??

Thanks

 

I don't have an answer for you, but I'm currious why you ask. My first project on my seven was to get the dome light working again,.. I never figured out why the wires would spark (and consequently blow the fuse) but not power the little light bulb in there. I never finished that project because I had too much fun stripping the entire interior, and since I wasn't going to rewire the rear view (hanging wires and all that) there was no reason to fix the dome light.

In other words I want to know why you'd need to knowth the voltage, incase I do decide to fix my dome light sometime this decade.

 

the door switch is the ground, so you should have 12v at the dome light. i think. i'd be looking in the FSM, its a simple circuit. there is a fuse too.

 

its the last thing left to fix on my car other than the bitch aka the horn.... i thought it should be 12v..... the fsm isnt really that clear it says its suposed to read 5 watts at one side and 6 at the other end which even if added togeather still wouldent make 12 V looks like another custom job same with the dam horn|

Thanks any ways

 

This picture shows how a radar detector can be hardwired to the overhead light. The Blue/yellow wire should have 12V with ignition on or off. Black/red wire goes to the door switch. It is grounded when the door is open and nothing when door is closed. The mirror console is grounded by the screws that attach it to the roof. The lights I have been able to repair needed one or the other of the wires to the main bulb holder re-soldered.

 

i think your set ups for a power roof also... shouldent make a difference it still probably needs 12 V... any one know what type of bulb i need i think mines the wrong type

Heres some pics of mine .....and yes thats a 82 rx7 office chair

http://s451.photobucket.com/albums/qq234/sidewayzrx/

 

Watts are a power rating of the bulb. P=IV or Power (Watts)=Current*Voltage.

 

try

https://www.rx7club.com/showthread.p...errerid=115566

 

so today i cheaked the voltage with the door open 12V!!!...thats just crazy... so im just gunna pick up a new mirror off the nex rx i find thats gettin parted

Thanks for all the help

 

Sounds like a bad ground. You should have 12V from one wire, a constant gnd and then a gnd that is triggered by the doors being open. If you are reading 12V with the door open, that means the door gnd and the 12V line are fine. Its the constant ground that is giving you issue.

 

door switches are probably intermittant....

 

What do you mean by intermittant?

Thanks

 

No power roofs in FBs. My picture is of the back of the console that the mirror attaches to. You have snapped the mirror out of it's base. I removed the two screws that hold the entire assembly to the roof. When you test the voltage, red lead goes to the wire coming from the roof, black lead goes to ground, right. Make sure you have a good ground contact when testing. I've had screwy readings turn out to be me not making good ground contact while testing. The mounting screws I removed are the ground for the lights. One of these would be good to use as your ground.

 

The bulb is DE3021, unless you are talking about the map reading light (the one that toggles from driver's side to passenger's side)

 

DEFINITELY READ THIS LINK LASCELLES SUGGESTED. I encountered the same problems when attempting to change my bulbs on the '85 I had !

 

Corrosion between the contacts and the body. Take them out and lightly wire-brush them,

 

This is probably obvious, but you have to take the bulb out to measure the voltage properly (aka 'open-circuit voltage').

Otherwise, you're measuring across a resistance, & you only see the drop across the component.

 

they only work sometimes

 

i think im just going to wire up a multi l.e.d light and just Jb weld it in....or do what the link says

thanks

 

got the new mirror works awsome even got a map light boo ya!......had to mess around with the tightness of the screws to get the lamp to work but its good to go

Thanks again