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Old 11-20-2022, 02:26 PM   #1
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Default 99 SC2 Possible F5 with a twist

I've been having issues with my 99 sc2 not starting, battery drain, chime and radio not working. Upon researching the issue I came across the common F5 issue. Now, here is where my situation takes a left turn, the red power wire that leads to the F5 terminal has a black wire spliced into it that was connected to the opposite side of the fuse panel to the chime fuse. This had allowed the car to start, but had caused melting of the plastic around the terminal. My question is, is this wire supposed to connect to something else on the circuit or was it some sort of band aid from the previous owner?
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Old 11-21-2022, 09:37 AM   #2
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1999 SL2
2001 SL1
Default Re: 99 SC2 Possible F5 with a twist

I'd say Band-Aid solution from the previous owner. When the F-5 terminal overheats from an overloaded circuit (cigarette lighter used for power and/or high power aftermarket radio) the terminal becomes hot and melts the plastic around it including the housing. Eventually the connection becomes too loose and you lose that circuit which also supplies power to the fuel pump. Who ever was there before you bypassed the circuit by tapping the supply wire and going around to the corresponding fuse on the other side. The correct fix is to clean and tighten the contacts and resolve the root cause by powering the cigarette lighter and/or aftermarket radio with another circuit. Alternatively, stop using the cigarette lighter to supply power and/or put the stock radio back in if applicable.

The F-5 circuit supplies power to the fuel pump, radio, cigarette lighter, chime and dome light.
1999 SL2 MT (311,300 km @ 01/2023)
2012 Ford Focus SEL HB MT
2011 Suburban LT

Past Saturns
2001 SL1 MT (438,500 km 11y)
1993 SW2 AT (10y)
2001 LW200 MT (3.5y)
1992 SL2 MT (5y)


Last edited by trottida; 11-21-2022 at 09:42 AM.
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