SweetZRag

Hi all. This is my first post and I thought I would contribute. I recently had a problem with my dome light staying on and draining the battery in my 1983 380SEC. I determined it was a bad electrolytic capacitor on the dome lamp relay board located inside the dome lamp. During my investigation, I couldn't find this part for a reasonable price or much information to troubleshoot and repair the circuit board so I reverse engineered it and repaired it myself. I have attached the schematic and parts list to his post. i couldn't identify a few of the diodes but for the harder to find parts, I provided links to spec sheets. All of the part numbers listed on the pdf attachment are for Digi-Key (www.digikey.com).. I hope this helps someone here fix their issue. I do not know what other model years this applies to but I can say for sure this is the time delay relay (TDR) board in my 1983 380SEC dome light.

Parts
Transistor (Q2) - ITT BC 212A Spec Sheet: https://alltransistors.com/pdfview.p...dire=_motorola
Transistor (Q1): National Semiconductor, BD675, Darlington Pair, Source: http://www.onsemi.com/PowerSolutions...ct.do?id=BD675
Resistor - 10Kohm, 5%, 1/8Watt (Brown-Black-Orange-Gold)
Resistor - 82ohm, 5%, 1/8 Watt ( Grey-Red-Black-Gold)
Resistor - 2.2Kohm, 5%, 1/4Watt (Red-Red-Red-Gold)
Resistor - 2.2Kohm 5% 1/8 Watt (Red-Red-Red-Gold)
Resistor: (R1) - 470Kohm, 5%, 1/8W, Located under IC
Resistor (R2) - : 820Kohm, 5%, 1/8W, Located under IC
Diode: Unknown
Diode: Unknown
Diode: Zener (red with black band)
Diode: 1004
Diode: 22
IC Timer: MC1455P1 L8217 Motorola, Spec Sheet: https://www.onsemi.com/pub/Collateral/MC1455-D.PDF
Capacitor: Tantalum (Green Blob): 4.7uF, 16V Polarized
Capacitor: Electrolytic (Blue Can), ISKRA, 33uF, 25V, 12M, Polarized

Good Luck!

Jeff