frebor72

My odometer buttons works but not the backlight. How do you replace the bulb/bulbs behind those four buttons?

I think there is a thread in this forum about that but I cant find it

Bob88GTA

iTrader: (2)

Just remove that section and pull the screen gently from the socket and replace the bulb

frebor72

It's not the lcd screen backlight. It's the backlight for the buttons. I managed to replace all bulbs in the dash this spring but now I realized that these four buttons doesn't light up like the others.

frebor72

Is it one bulb/lightsource for each of the four buttons or do they share the same bulb? Its har to tell if you look at it från behind

TransamGTA350

iTrader: (2)

I'm not sure if the lights in those buttons are the same, but I replaced the backlights lights in my fog light, defroster and hatch release buttons. They look similar though.

I was able to carefully take the switch apart, unsolder the bulb and solder in a new one. I matched up the bulb by measuring it with a dial caliper and also measuring the resistance of a working bulb and calculating the wattage. I don't know the bulb model number since I did this a long time ago and don't have a record of it.

frebor72

I managed to take the buttons apart. They share one bulb. It´s marked "73". I´ve been searching the net and it seems to be a t5 bulb 1.2w. Is 73 always approx a 1.2w bulb or is it possible that it is a brighter bulb?

TransamGTA350

iTrader: (2)

I don’t remember the wattage rating of the bulbs that I used as replacement, but I similarly had to figure out the closest wattage rating and find a bulb that was close in size and wattage.

if you have one good existing bulb, you can take a resistance reading using a multimeter and then calculate the wattage. Read the resistance in ohms and the formula is

P=(V^2)/ohm
Where: P=power (watts), V=volts

John in RI

iTrader: (167)

Pretty sure that the #73 bulb is the same bulb that was used in the 95?-02 S10, Blazer, S15, and Sonoma truck visor vanity mirrors. That's the same (push type - not soldered bulb) bulb I search thru junkyards for to use inside the 80's Thirdgen Delco Radios.

jlweaver

@frebor72, how did you take the buttons apart?