poicow

the headlights both work on low beam, but when you put it to high beam both lights would not come on in high beam, dash board shows high beam is on but both sides lights won't come on in high beam

any suggestions

thanks

LiCelsior

iTrader: (32)

check if the bulb is blown...

poicow

how do you check to see if the bulb is blown

LiCelsior

iTrader: (32)

take it out and look lol. the LS has 2 bulbs one low beam and one small high beam.

JimsGX

hmmm... My 91 only has a single high/low bulb, 9004 style.

python

iTrader: (4)

thats what he meant

trukn1

Has to be a blown terminal out on the bulb itself. The first gen is a dual stage/single bulb. Stage 1 is for low beam, stage 2 is for high beam. If your lows work, and your highs register on the dash as being on, but they are not, the high beam terminal on the bulb itself is blown. Simple replacement of the bulb will fix.

mrmox

It is April 2023 now, and it was because I thought it was extremely unlikely that BOTH bulbs would blow the same filament that I was reading up on other causes of light failures in these forums.

BUT that is exactly what happened! Both bulbs needed replacing virtually simultaneously.
I decided to try a different brand, but the store only had 4 grades of Sylvania in stock.
Which led me to this discovery:




So there's that! Sometimes you pay more but get less!

Last time there was a bulb out I bought the 2-pack fancier bulbs and replaced both thinking to keep the illumination balanced.
And I replaced both. So they may have burned out right on schedule!
I had saved the OLD still-working bulb and bought one new Basic and all 4 filaments are working again.


Reminded me of this:
https://en.wikipedia.org/wiki/Phoebus_cartel

timmy0tool

iTrader: (7)

always replace bulbs in pairs bc if one side went bad, then the other is likely on it's way out too.

silverstars run at a higher wattage = more light output, but less life span.