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Probably a 50 watt halogen
See "Replacing Bulbs" on page 50 of Chapter 11 "Maintenance and Service" in your "OWNER'S MANUAL"..... See the Sources and Related Links section below for light bulb information.
It is possible that the headlight door wiring is degraded to the point of not working. After nearly 50 years, it could be time to replace the wiring harness.
NO! There are 50 bulbs in a 2.5 volt string or 125 volts. There are 35 bulbs in a 3.5 volt string or 122.5 volts. If you put 50 3.5 volt bulbs in you will have 175 volts and most american house have 110 volt service so you will have dim bulbs.
Sadly, the answer is... "depends". There are several different ones out there, possibly by model year. There were also more models in a given year which didn't necessarily have the same bulb. I found this out while trying to chase down mine... Best bet is to pull the bulb so you can get a part number off the base. Or get your shop to replace, and then it's their headache figuring out the part, but expensive to get done relative to the amount of work.
There are two lights to each side, (low and high) at the back of the headlight assembly. It is accessed from under the hood. You will see where the wires go into the Headlight assembly which is the connector for the bulb. That turns about a 1/4 turn and then slides straight out. Once you have the light out you have to squeeze the base of the connector to release the bulb. The bulb is held in by a small plastic lip that when you squeeze the base of the connector is freed up. You pull the bulb straight out, but you will most likely have to apply some muscle as the lights are weather tight. That means they have a rubber or silicone weather strip around the base of the bulb that seals out water and it can make for a very tight fit. When you have the bulb out just replace it with the new one being careful of 2 things. 1-Don't touch the bulb as your skin oils can prematurely ruin the bulb or worse yet make it pop. 2-Make sure you put the correct watt bulb into the correct side. Each assembly has a high (60 or 65 watt) bulb and a low (50 or 55 watt) bulb. If you don't put the right one in the right side you could inadvertently turn on your high beams every time you turn on your lights and the oncoming drivers will be blinded by your lights.
A 50 watt bulb designed to run on 12 volts takes 4.17 amps. A 50 watt bulb designed to run on 230 volts takes 0.217 amps.
It's relatively simple, however you need a thin wrist. 1. Dislodge the front brake air duct. 2. Reach in the front brake duct and follow wiring to the parking light housing assembly. 3. There's clip on the bulb housing that needs pressure applied, then gently rotate the bulb. 4. Simply remove and replace bulb. That will save about $40 to $50. If your wrist is too big, there's an alternate method: 1. Manually open the headlight (there's a round rubber cover over the control). 2. Remove the plastic headlight wrapper (3 screws). 3. Reach in through the opening to get to the light housing assembly and follow steps 3 and 4 above.
It's a halogen bulb
Manual describes it in section 10-50. 1. Disconnect the electrical connector, then remove rubber cover. 2. Remove the retainer spring. 3. Replace the bulb, then set the retainers spring securely. 4. Install the rubber cover with the top mark facing up, then reconnect electrical connector. This is simple and easy if the bulb assembly comes out easily. I completed steps 1 and 2 but instead of the bulb assembly simply sliding out the back cover on the contacts came off leaving me with the three contact prongs and nothing much to pull on. I used a pair of pliers (if you have needlenosed it might be better/easier) and g e n t l y pried the rest of the bulb assembly out and the rest went smoothly.
i have a 2007 Pontiac grand prix and if you are in el paso Texas it only cost me $60 $50 for the light $10 for the service at the auto shop on dyer
GU10 bulbs are LED based bulbs, which help you to cut down on your electricity bill. In it's complete lifetime one GU10 bulb will save you more than $50 and if one replace a 100 Watt bulb with a GU10 bulb the energy consumption will go down drastically.