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Can anyone tell me definitively which the left and right relays are?

"30" is DIN nomenclature for "positive direct output from battery." Comes off battery side of fuse #4, goes through a fuse, then to relay contact #86 on the "control light relay" or hazard relay- then to terminal 30. So this is "hot" all the time.

L and R are the leads to the left-side and right-side signals, respectively.

S is a switched ground, from the switch. When the switch is pulled out, terminal 2 of the switch, the ground, makes contact with terminal 1, which grounds terminal #85 on the control light relay. This actuates the relay, which DISCONNECTS power from the blinker relay (#44 in diagram). It also grounds terminal S on the hazard blinker, completing its circuit and causing it to blink- 0, 12v, 0, 12v as the bimetal strip bends back and forth inside the can. Finally, 12v is picked off the L terminal which is routed back to the switch, which lights the bulb (the red lamp on the switch).

OK, and the circuit logic for the turn signals. . .

The blinker is a thermal type with a bimetallic strip- it heats up and opens, then cools down and closes, providing a pulsed =12v. The "C" terminal conforms to DIN 72552, it's the "Pilot" or indicator contact- and the others are 49 and 49A, the "input" and "output" from the turn signal flasher.

The "input" power to terminal 49 comes from the normally closed contact on the control light relay (the hazard relay).

So basically, when you throw the turn signal switch left or right, you complete the path to ground-- from battery through control light relay to input to output to turn signal switch through turn signal switch to 'Y' connector, one branch of which is to the bulb and to ground. The other branch of the 'Y' is connected to the hazard flasher-- it's what allows the hazard flasher to power the turn signal switch when the blinker is disconnected.

When you pull the hazard switch on, it energizes the hazard relay - which flips the wiper over to the NO contact - and OPENS the NC 87a contact - which removes power from the blinker input.

By the way, the can was made by Stribel (AFL Stribel GMBH).
Last modified: Mon, 20 Jun 2005


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