Engine revs when lights on - Ford Powerstroke Diesel Forum
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Old 12-21-2008, 09:00 AM
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Engine revs when lights on

I have a 94 7.3 IDI bus with lots of exterior lights. When I turn the headlights and clearance lights on, the engine immediately sounds like the rpm steps up. I don't have a tach so I can't tell. Is there a device that steps up engine speed to increase altenator output?
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Old 12-21-2008, 09:34 AM
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im sure the engine detects a major amp draw its probably normal
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Old 12-21-2008, 05:09 PM
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IDI engines don't detect a darn thing. Now it probably does have a charge protect system, where when the amps being drawn goes up, it triggers a vacuum solenoid that pulls the throttle lever. All the older ambulances have them. I would guess a bus would too.
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