If you think he can use a relay off of a R65 (/7-ish), I have one for the price of a forum donation.
But I will need help figuring out which one it is.... It came with a T.S. buzzer, and there is a relay in the description for that.
I have one in my hands. It has 4 contacts; 30 & 87a are the switched contacts (open/close) and 85 & 86 energize the circuit. On the side it says 1 243 560.3 and a date of mfg. - 11/78.
Needs cleaned up.
http://www.realoem.com/bmw/showparts.do ... g=61&fg=33
No. Description Supplement Qty From Up To Part Number Price Notes Photo
01 Horn 1 61331243486 +core, ENDED
02 Hex bolt M8X16 3 07119901190 ENDED
02 Hex bolt M8X16-8.8-ZNS3 3 07119902900 $0.36
03 WAVE WASHER B8 3 07119932121 ENDED
04 Washer A8,4-ZNS 1 07119931019 $0.40
05 STOP LIGHT SWITCH 1 61311353684 $58.32 +core
06 Cap 1 61311351249 $8.61
07 Fillister head screw M4X12 2 09/1982 07119907663 ENDED
07 Fillister head screw M4X12 2 09/1982 07119900692 $1.80
08 WAVE WASHER B4 2 09/1982 07119932033 $0.09
09 BUZZER 1 08/1979 61311243490 ENDED
FOR BUZZER
10 Relay 1 08/1979 61311373916 $23.75
FOR FLASHER
11 HAZARD WARNING RELAY 1 61311244392 $40.98 +core
FOR DAY-LIGHT-DRIVING
12 Relay GELB 1 61311373585 $23.75
FOR STARTER
13 Relay in zinc yellow 1 61361389105 $23.75 +core
14 INSTALLING SET DOUBLE SIGNAL HORN 1 61331243889 +core, ENDED
15 Horn 420HZ 1 61331243710 $60.79 +core
16 Bracket 1 61331243743 $23.70
17 WIRING DUAL HORN 1 61121243752 $48.15 +core
18 Cable strap L=200MM/B=3,6MM 1 61131367599 $0.43
19 STOP LIGHT SWITCH 1 61311244070 $13.70 +core
20 Shackle 1 61332306792 $4.35