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I also want to know these, ive got a couple of the orange ones that are out on my dash binnacle.
Black B3 1990 CQ 2.3E converted to ABY & 6spd. (301bhp) - Now Sold 03 Dolphin B6 S4 Avant LPG - New Daily Wagon
01 Silver D2 A8 3.7 quattro sport - SOLD
The only one i know for sure it has to be "at least 2W" is the battery light.
Iff is lower wattage the charging system will not work right.
All the best!
Don't know what the S2s came with but the UrS4s came with 1.1 W orange base bulbs. The common upgrade is to light green base 2.0 W bulbs. OSRAM is a typical supplier.
RS2'd 93 UrS4 5 spd sedan
94 UrS4 V8 6 spd manual avant
Iff the bulb has lower wattage, the field current needed for the regulator is to low...lower than aprox 3 volt as the resistance in the bulb is higher. you need more voltage at startup for the regulator to start control the field current in the alternator.
The field voltage comes through this bulb....
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