Stop Light Turn Signal Wiring Diagram 2 Prong Relay
Turn Signal (Indicator) Flashers and 4-Way Hazards
VW used a number of different schemes over the years on some Beetles and Busses. This article explores around of the Thomas More common aspects of the circuits.
By and by, the 4-terminal flasher relay was replaced with a somewhat simpler 3-terminal aim.
Outwardly, the only difference is in the connection for the dah indicator.
The flasher receives power from one of 2 fuses, dependent on whether OR not the Hazard switch over is operated. The same flasher is used for both Turn Indicator and Hazard functions.
Internal circuitry in the flasher keeps a small "sense" voltage on Terminal #49a day in and day out. When the Indicator stalk is pulled to Left or Right, the Index bulbs on that side are connected to Terminal #49a and payload the flasher circuit so that IT knows to begin flashing. Immediately, the internal electrical relay contact closes from (+) to #49a and the bulbs light-duty. The blinker electronic circle then turns the relay off and on to provide the flashing rhythm.
The 4-terminal blinker has a well-stacked-in payload detection relay which drives the pall indicant. The dash indicator flashes in time with the Turn of events Indicator bulbs.
The dash speedo index bulb used with the 3-terminal flasher relay is connected from the (+) supply to #49a and it flashes opposite to the Turn Index bulbs. For exercise, when the Turn Indicant bulbs are light, there is +12V present at #49a. That means that both sides of the flair bulb accept +12V on them and no current can flow thru the bulb.
The solely difference in circuit operation for Hazards is that the flasher receives power from the second primer, which is live whether operating theater not the Ignition is switched On or not. The Hazard swap has another set of contacts (not shown here) which connects both Left and In good order sets of bulbs to the flasher.
Hazard Switch Operation with 3-wire Indicator substitution
Later Beetles and Busses which had separate Stop and Flex lamps in the rear used a relatively simple Jeopardize switch transcription. I've drawn it Here in a form which shows the mechanical functioning of the switch contacts.
Hera again, the Hazard switch selects the power source for the flasher from same of 2 fuses.
The lower switch section connects both Left and Right bulbs to Term #49a on the flasher so that whol 4 bulbs flash.
6-Cable Index Switch
Now lets turn to the Turn Signal system used on early cars. From the mid 50's thru 1961, cars which did not have semaphores used the Stop lights to double as the rear Turn indicators. To coif that, a special Flex Signal switch with 6 wires instead of the later 3-wire design was old. This switch had to route the flasher output to the Brake swooning being used for Turn reading while leaving the odd Stoplight to function from the Kibosh light switch. The circuit looks like this:
This arrangement was too used on (U.S.A) Busses clear thru the 1971 model. Only in '72 did the US Bus get separate Stop and Turn bulbs.
Early Bus Hazard wiring
'62 thru '65 models used a switch and a relay to provide 4-way flashing Fortune lights. The switch connected both rear lights to the flasher and simultaneously on-line a relay to the flasher. The relay in turn powered some Left and Right front indicators from a come apart conflate origin. In early quarrel, the electrical relay switched on and off, eventually with the flasher, thus flashing the forepart lights.
Greatly simplified, the circuit looks like:
9-Terminal Flasher on BussesSource with the '66 model and continuing thru early '68, the infamous 9-terminal flasher came into free rein. Matt Roberds has done an excellent job of describing the circuit operation and I won't essa to duplicate that here. For the details, go to:
http://www.type2.com/library/electris/vw-9prong.html
From Late '68 thru '71, the 6-wire Change state indicator switch was married to a complicated Risk switch in order to do away with the expensive 9-terminal flasher. The composite plot is shown here:
When the tack is pulled Out:
1) King for the flasher is shifted from Term #15 to #30, which is live day in and day out.
2) Flasher Terminal #49a is connected to both Front Index number lights.
3) The Stop light switch is disordered from the rear lights and they are both on to the flasher (via the Turn signal change over).
Converting early Bus (preceding to '72) to have separate Stop and Turn lights.
US Busses from '66 thru '71 can comprise fitted with separate brake (or separate turn) lights with the addition of one wire to the Main harness going from front to rear. The Blk/Red wire from the passkey cylinder pasture brake switch(es) must first glucinium disconnected. This wire throne be constitute on the 9-depot flasher #54 surgery on the Hazard switch connected later Busses which don't have the 9-terminal flasher. The recent conducting wire give the axe then be spliced to the Blk/Red wire or connected right at the brake switch terminal. The wiring looks like this:
Flasher Internal Circuitry
For anyone curious in the detailed workings of the flasher electronics, I've included typical circuits from both the 4-terminal and 3-terminal flashers. Billet that there were numerous variations connected these designs over the years, these are just typical.
Source: http://www.netlink.net/mp/volks/htm/signals.htm
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