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October 23, 2020, 11:14:28 PM

Headlight relay - flummoxed

This is a discussion for the topic Headlight relay - flummoxed on the board Beach Buggy Electrical Help.

Author Topic: Headlight relay - flummoxed  (Read 171 times)

this user is offline Bzad

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on: October 18, 2020, 02:10:26 PM
So.  After repairing old wires etc I now have headlights, sidelight and indicators! 
However, main beam -  when switching - low to high works fine but wonít toggle back to low beam. 
Where do I start? Relay? Dodgy earth? Any help gratefully received


this user is offline snoopy

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Reply #1 on: October 18, 2020, 03:28:48 PM
you may have the live feed on the main beam terminal and beam on the live or low beam one, does the headlamp main beam flash work with ignition on


this user is offline Bzad

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Reply #2 on: October 18, 2020, 04:32:44 PM
Wrongly connected to wrong terminals, ok, makes sense

No.  No flash with ignition on. 
How do I identify terminal numbers
5 pin relay, no numbers only a schematic on side


this user is offline Bzad

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Reply #3 on: October 18, 2020, 04:47:37 PM
Itís this one
Checking wires I seem to have it right



this user is offline snoopy

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Reply #4 on: October 18, 2020, 05:26:46 PM
30 is a ignition switched live auxiliary a black and yellow wire. S earth through the micro switch to change the lights over dip/ main.

pull the wires off and leave 56 from light switch, 30 from aux or bridge and S connected, the relay should toggle between the two functions easily checked with a meter or bulb on pins 56 a and b new relays have been known to be faulty.


this user is offline Bzad

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Reply #5 on: October 18, 2020, 06:01:57 PM
Thanks.  Iíll give it a go.
Suspecting faulty as its ancient and not clicking at all now.
Thanks for your help.   
Itíll be over in Evesham soon I hope.


this user is offline snoopy

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Reply #6 on: October 18, 2020, 09:18:43 PM
we are easy to find not sure if there is a headlamp relay in the shed.


this user is offline Manxdavid

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Reply #7 on: October 19, 2020, 03:47:07 PM
That's why I always just fit a foot dipswitch, to keep things simple. The only relay of sorts on any of my builds is the flasher unit. ;-)up
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this user is offline Paul1953

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Reply #8 on: October 20, 2020, 07:40:52 AM
This relay is to the best of my knowledge unique to VW and was taken up by thousands of guys who`s motors like mgb, midget etc etc had no headlamp flashing facility.

The "S" terminal is crucial. It is a negative lead, ie ground\earth. When connected correctly with a good connection to earth via the column switch it toggles dip to main beam and back using the column switch lever arm. A quick pull towards you to toggle. For Headlight Flash you pull back and hold back for a short period. Take care in this circumstance because the head flash brings all four bulb filaments on at the same time. That is to say both dip beam plus both main beam filaments at the same time. (Measured 17 amps on my buggy in this mode). 


this user is offline Bzad

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Reply #9 on: October 20, 2020, 05:45:15 PM
Thanks for all your help. 
Sorted !!!  Relay was shot.  Got a new one and hey presto!   
Really appreciate your input team.