Road Illumination


Tracks 155 to 168 cover the supply of power to the front headlamps, parking and driving lights. High and low beam are controlled by switch E4 on the indicator stalk.

Headlamps and their controlJ-Front handles the main lamps on the left of the front of the car due to its proximity. J-F-Right deals with the lamps on the front, right. Cable sizes are significantly reduced because the vastly reduced cable length from stock which means that there will be much less voltage drop between battery/alternator and the lamp.

The main deviation in connection of the lamps is that the driving and high beam lamps (56a terminals) aren’t wired in parallel but separately controllable. That means that the driving lights (L13 and L14) can be selectively switched on and off; perhaps automatically, based on road speed.

Operation of the high-/low-beam switch E4 is monitored by J-DC. As there is very little current running into the switch with networked electrics, the cable sizes are reduced as far as possible; 0.35 mm² is shown but the availability of suitably colour-codes cable and crimp connectors for the terminal housings may result in 0.50 mm² cable being used in practice.

Emergency Indication

In tracks tracks 169 to 182, we see that the indicator stalk also incorporates (obviously) a set of direction indicator switches (E2) and an emergency flasher switch (E3) with telltale light (K6).IndicationsJ-DC monitors the switch states using a minimum set of contacts and drives the telltale lamp when necessary.

Again, minimum cable size possible is employed when possible.

When the emergency flasher is engaged, pin 49 will be pulled to pin 30, at the E4 part of the switch block. J-DC then drives K6 by toggling pin 49a.

The indicator stalk can, as standard, be positioned to either side with the ignition off, to switch on the parking lights on the corresponding side of the car. Those parking lamp contacts (P, PL, PR) in E2 are used for detecting direction indication. This makes the “decoding” of the switch position much simpler.

The whole blinking mess will be described in the pages to follow.

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