I have a 1004 bulb which has blown - the interior light.

What wattage bulb/type will replace the 1004?

Thanks

Why do you want to change the size?
1004 specs.
Amperage: 0.94 amps
Base Type: BA15d
Bulb Configuration: B6
Bulb Part Number: 1004 LL
Bulb Type: Incandescent
Color Temperature: 2800 K
Color: Clear
Diameter: 0.75 in
DOT / SAE Approved: Yes
Filament Configuration: C-6
Filament Quantity: 1
Length: 1.75 in
Light Center Length: 1.06 in
Lumens: 188 lm
Package Quantity: 2
Rated Life: 325 hr
Voltage: 12.8 v
Wattage: 12w

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

Replace your burned-out 1004 with...a new 1004.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Where do I get one? In Australia 1004 means nothing to the auto shop guys, hence my Q on the wattage.

Is eBay item number:111669236504 ok for the internal courtesy light?

Yes, those GEs are correct, but you can get the correct bulb locally.
Narva Australia #47004, second item on this page:
http://www.narva.com.au/products/browse/interiorpark

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Sweet!

How can you test them with a multimeter?

Warning the above formula is junk science for this example spewed from an addled brain. Disregard this post and skip down a few posts where I correct what was said here.... just below where Dan tossed down a flag on the play.

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67' Dart GT Convertible; the old Chrysler Corp.
82' LeBaron Convertible; the new Chrysler Corp
07' 300 C AWD; Now by Fiat, the old new Chrysler LLC

That works for resistors, but not for light bulbs. You can check whether the filament is intact (if so, you get continuity between the two base contacts of a 1004 bulb), but that's it.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Sorry for steering in wrong direction, brain fart attack.

Dan: OK

Hook up the bulb to 12v, illuminate it, and measure amperage drawn.

Watts more or less is the same "number" not units as Volt Amps. Suffice it to say close enough for this illustration where watts or volt amps = amps x voltage. As filament heats up it its resistance increases. So as Dan implied, cold filament = no resistance or close to zero ohms measured; there is some negligible resistance in any conductor.

When an incandescent light bulb is turned on there is an instantaneous surge of current through room temperature incandescent filament which quickly, no, almost instantaneously throttles current flow as filament heats up becoming more resistant. This takes place in micro second.

_________________
67' Dart GT Convertible; the old Chrysler Corp.
82' LeBaron Convertible; the new Chrysler Corp
07' 300 C AWD; Now by Fiat, the old new Chrysler LLC