MINIATURE LAMPS

MINIATURE LAMPS

• There are several types of miniature lamps• You need to learn how to test and replace

them.

Bayonet style

- S.C. Bayonet -The lamp on the left is a Single Contact (S C)That means there is one filament inside the light bulb. The index pins are at the same height. It does not matter what way you put it into the light socket assembly.

- D.C. Index-The lamp on the left is a Double Contact (D C). There are two filaments and one is brighter then the other (tail lights & Brake Lights. Also the index pins are at different Heights so it will go into the light socket assembly only one way.

Bayonet style

Notice the index pins on the light One is higher then the other

Bayonet style

Single Contact Double Contact Double Contact Amber These all use the base of the lamp for Ground.

Wedge

These are very common on side markers and brakes and tail lights. Come in all different sizes and candle power.

Candle Power (cp) is the Brightness of the Lights or the light intensity. New Term is candela.

One side is power the other side is ground.

Wedge

They also come in different colors.

Wedge use a twist lock base

Plastic Wedge

The 3156 on the left has one filament therefore it has one wire on the each side of the base.

The 3157 on the right has two filaments so it has two wires on the base.

Clear & Amber

Some bulbs are clear Some are amber for turn signals

Same is true on Plastic Wedge

Tail Light Lens

Clear Turn signal Amber Turn signal

May use a clear bulb behind a amber lens

Must use a amber bulb behind a clear lens

To test a Plastic Wedge bulbTake Negative wire and clip it to both wires on one side

Attach the Positive lead to the front side of the bulb

Flip the bulb over and attach the Positive lead to the other side

See how we have wires on each side of the bulb (3157)

To test a Wedge bulbHook up the wires to both sides of the bulb And it will turn on

Courtesy lamps

Ridged Loop topEnd Cap bottom

Festoon type

Instrument panel lights

Some times we need to replace dash lights how do we do that?

Many different types of bulbsused in Instrument panels

194 Used in a twist lock socket

#74 #37 #24 #194

#74 too small?..#194 too big? Could be a # 24

#74 & 37 are T1 3/4 #24 are T2 3/4 #194 are T3 1/4

Some dash lights use LED’sLED Lights come in several sizes

NeoWedge Twist Lock BAX series

Pictures from

NeoWedge series

• Available in 3mm, 4mm, 5mm sizes• To choose the correct bulb, measure the

diameter of the base• Type A (T3) 3mm base is 8mm= 5/16“• Type B (T4) 4mm base is 10mm= 3/8“• Type C (T5) 5mm base is 12mm= 15/32“• Info from

NeoWedge series

Remember when you test these light bulbs they are LED’s you must have the right Polarity in other words, you have to Hook up the power to the right side. A Diode is a one way check valve. If you hook it up backwards it will not work.

Different colored Dash lights

MINIATURE LAMPS

Picture - Thanks to thehttp://www.bulbman.com