Dr.Jeff
True Classic
I've been going through my '79 X's electrical system as part of the complete restoration/customization projects. One circuit I still can't quite figure out is how the headlight switch, the high/low switch, the changeover relay to the pods, the relays for the pod motors and other related components are wired. It's my understanding the '79 is unique in several aspects of this particular circuit. Therefore many of the threads relating to aspects of the lighting circuit do not pertain to the '79. Some of it makes sense but not everything.
I have the '79-only wire diagrams and have physically traced every wire from its source to its destination but I'm still not clear how the changeover relay ("lighting relay" according to Fiat) interacts with the "up/down" contacts on the pod motors, the relays to those motors, and the headlight and steering column stalk switches. It appears power comes through the headlight and column switches to the changeover relay, and then to the two up and down pod circuits, but somehow also to the parking/side marker lights and headlight relays (I realize that isn't possible but that's how it looks).
Some of the components involved include fuses "G and H" for most of the outside lights, fuses "I and L" for the headlight motor relays, as well as fuses "Q and R" for the up and down functions of the pods. As noted the main headlight switch and the steering column "high/low beam" switch are also in the circuit. Plus there's also lots of other things like the switch for the cluster lights with its resistors, the dimmer rheostat, the ignition switch, the clock, warning lights on the instrument cluster, fuses "A and B" (all of the 'switched' circuits), etc, that are tied into all of this. But for the most part all I'm really interested in is how the "lighting (changeover) relay", headlight switch, and the outside lights interact.
Can anyone please "enlighten" me with "illuminating" knowledge on this.
I have the '79-only wire diagrams and have physically traced every wire from its source to its destination but I'm still not clear how the changeover relay ("lighting relay" according to Fiat) interacts with the "up/down" contacts on the pod motors, the relays to those motors, and the headlight and steering column stalk switches. It appears power comes through the headlight and column switches to the changeover relay, and then to the two up and down pod circuits, but somehow also to the parking/side marker lights and headlight relays (I realize that isn't possible but that's how it looks).
Some of the components involved include fuses "G and H" for most of the outside lights, fuses "I and L" for the headlight motor relays, as well as fuses "Q and R" for the up and down functions of the pods. As noted the main headlight switch and the steering column "high/low beam" switch are also in the circuit. Plus there's also lots of other things like the switch for the cluster lights with its resistors, the dimmer rheostat, the ignition switch, the clock, warning lights on the instrument cluster, fuses "A and B" (all of the 'switched' circuits), etc, that are tied into all of this. But for the most part all I'm really interested in is how the "lighting (changeover) relay", headlight switch, and the outside lights interact.
Can anyone please "enlighten" me with "illuminating" knowledge on this.
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