I believe you have a short somewhere that is causing excess current to flow in that circuit or wiring which causes the fuse to open. Falcon (?) being an old car. Without a wiring diagram (schematic) a long hard visual inspection may be your best bet. Good luck!
On my 2000 AU wagon the problem was caused by the rear window wiper motor falling apart, allowing the brushes to short together. Try disconecting at the plug inside the tailgate and replace the fuse. Time will tell if that's the problem.
The screens are not interchangeable on sedans, both long and short wheelbase, as the turret was changed for the BA. The screens are interchangeable on the wagon and ute, because they continued with AU turrets in to the BA for the ute and wagon. So if you look at your VIN: JGSW = No JGLW = No JGCM = Yes JGWA = Yes Hope that helps.
I would suspect either a short to ground in the circuitry, or excessive mechanical resistance from a faulty wiper motor.
The maximum speed of a 1968 Ford Falcon Wagon with a 6 cyl 116 HP motor was approximately 88 mph.
The least powerful 1975 Ford Falcon Wagon I can find had 130HP. It had a top speed of 153 kph (95 mph).
The maximum speed of the ford falcon wagon manual 6cyl 132hp 1974 is 340 kilometres per hour.
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Plenty of antique car collectors want to buy a 1965 Ford Falcon wagon. Many people fix these vehicles up for car shows and even for racing.
Mines is on the dash next to the windscreen nearside
The power of the engine and the maximum speed of the 1965 Ford Falcon wagon automatic are 105 hp and 144 km/h (89 mph) respectively.
Check your tow bar and trailer brake light wiring. It may be grounded. I had this problem with my 92 roadmaster wagon. Tom.
pressure in the fuel tank with out a vented gas cap