Checking the switch (VW Golf 1)

The switch operation is best checked with the red wire connected and live. In this book you should first find suitable connection diagram. Find the location of the electric current supply and its distribution on the diagram. The check is carried out using current lines.

Using a test lamp with a needle contact, you can pierce the insulation of a wire and determine which wires are conducting electric current.

First, check whether the switch is receiving voltage at all. To do this, turn on the ignition or lighting repeatedly.

Then they check whether the switch transmits voltage further in the corresponding position.

For example, for a glow plug starter switch the following is prescribed:

The red wire (terminal 30) should carry battery current at all times.

The grey wire (terminal P) is energized when the ignition switch is in neutral position: when the ignition key is turned, the wire is de-energized.

The article is posted on the portal [vwmanual]

The yellow/black wire (terminal X) is live only when the key is in the "Ignition On" position.

The black wire of terminal 15 receives voltage when the key is in the "Movement" position (1st stage). "Pre-heating" (in the production model until July 1977.) and "Start".

The red and white wire is live when the key is in the "Pre-Glow" position (in the production model until July 1977.) receives voltage when the key is in the "Start" position.

Using the connection diagrams, other switches can also be tested accordingly.