1999 - 2003 7.3L Power Stroke Diesel

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compression test....fuses?

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Apr 20, 2024 | 12:43 PM

#1

wwracer

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From: WILLOW AK

compression test....fuses?

I lost a cylinder on my 99 7.3 this past winter, looking to do a compression test today before I swap it out. Any fuses to pull to keep current draw to a minimum during the test?

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Old

Apr 20, 2024 | 12:57 PM

#2

cleatus12r

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From: Reed Point, MT

Quote:

Originally Posted by wwracer

I lost a cylinder on my 99 7.3 this past winter, looking to do a compression test today before I swap it out. Any fuses to pull to keep current draw to a minimum during the test?

Just make sure the transmission is in neutral or park and use a jumper wire on the fender mounted starter relay. Nothing else has to be on.

If you must use the key switch, pull the PCM diode from the underhood fuse box. This will keep the fuel pump and glow plugs from being energized.

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Apr 20, 2024 | 07:25 PM

#3

wwracer

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From: WILLOW AK

Key off....DUH... Geez I'm asking some dumb questions lately

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