Conversions & Swaps LSX Engines in Non-LSX Vehicles
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wiring question

Old Aug 18, 2016 | 10:05 PM
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F100Rudy's Avatar
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From: Beaumont, Ca
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Hi all,
I posted this in the new greeting section but I thought I'd put it here; I had a 2002 5.3 LS swap put into my 54 Ford F100 pick up. However, there is a battery drain 3.5 amps which I tracked to the external voltage regulator(on truck from previous 74 351m/400 motor)which the mechanic wired in to the harness. I suspect this should just have been excluded. I've been searching for a solution to this but I haven't been successful. Any help would be appreciated.
Thanks

Rudy
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Old Aug 19, 2016 | 01:14 AM
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Spaceboy1980's Avatar
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How is it wired? My swap goes from the alternator to the battery. Your regulator should not be hooked up at all. A picture is worth two in the bush as the crow flies and all that.
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Old Aug 19, 2016 | 07:16 AM
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04Z06vette's Avatar
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agree. if you are using the 5.3 alternator, you need to delete your old regulator and wire per the 5.3 diagrams.
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Old Aug 19, 2016 | 08:14 AM
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^^ What they said. Your alternator should be wired just like the 5.3. The wires going to the computer from the 4-pin alternator plug. Then the large gauge wire(s) going to battery/starter. No need to utilize any of the original external regulator equipment that was original on the 54.
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Old Sep 30, 2019 | 01:29 PM
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If you have an r44 alt , it will run as a one wire , without change , just hook up the charging stud to the battery , with the engine running it will put out around 14 volts , I have a couple vehicles running that way
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