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MOTRS

Falcon (XK-XP)

1960-1966 / Sedan / Convertible / Estate / Australia

All Falcon (XK-XP) problems All workshop issues
Critical Electrical

6-Volt to 12-Volt Considerations

Symptoms

Dim headlights, slow cranking, inability to run modern accessories, difficulty finding replacement bulbs and components.

Cause

The XK and early XL models used a 6-volt positive-earth electrical system. Six-volt components, bulbs, starter motors, generators, are increasingly difficult to source. The 6V system provides marginal starting performance, particularly in cold weather, and cannot support modern accessories like electric fans, driving lights, or audio systems.

Fix

Many owners have converted their XK/early XL cars to 12-volt negative earth.

This requires a new alternator (or 12V generator), 12V coil, 12V starter motor, 12V globes throughout, a 12V battery, and reversing the ammeter connections.

The conversion is well-documented in the Falcon community and costs $300-600 in parts.

It's one of the most worthwhile upgrades you can make to an early Falcon.

Cost mentioned in fix
$300-600 in parts

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// More Falcon (XK-XP) problems

Other known issues

Critical Electrical

Corroded Wiring and Failed Earths

Intermittent electrical faults: lights flickering, instruments dropping out, indicators not cancelling, horn intermittent, starter motor sluggish.
Common Electrical

Generator Charging Issues

Battery goes flat, ammeter shows discharge while driving, dim lights at idle.
Critical Rust (The Big One)

Floor Pan Corrosion

Visible rust perforation on the underside of the floor. Soft, spongy metal when prodded. In severe cases, daylight visible through the cabin floor.
Critical Rust (The Big One)

Sill (Rocker Panel) Rot

Bubbling paint along the lower body sides, soft metal when prodded, visible perforation.
Common Rust (The Big One)

Boot Floor and Spare Tyre Well

Rust in the boot floor, water pooling in the spare tyre well, perforation around the tail-light mounting points.
Common Rust (The Big One)

Lower Quarter Panels

Bubbling, blistering, or perforation on the lower rear quarter panels behind the rear wheels.
View all 18 Falcon (XK-XP) problems