Have a 99' Crew Cab XL with front speakers. Are the wires for rear speakers already in. Where can I access them from. Any tips helpfull!

 

If it was an XLT I would say yes it's likely to be pre wired for 4 speakers. An XL, probably not. Under the rear door scuff plate is where the wires run.
Present this question again and ask for front and rear speaker wire colors at www.ford-diesel.com in the forums(99 Powerstroke + up)and someone will answer. Use the title "wire colors needed" There are guys there with the electrical prints who would love to help.

Don't get discouraged if the site is not available. I have had a problem lately getting in

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1999 F250 SD CC, LWB, 5.4L, Auto, 4x4, Power TT mirrors w/ marker lights installed, White, Full Tint, PendaPro SR,
Flowmaster Delta 40 series, open airbox w/ K&N filtercharger.

 

There is hope ! I just read a stereo installation article in FULLSIZE 4X4 and a F350 CC PSD XL did have the rear speakers prewired.

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1999 F250 SD CC, LWB, 5.4L, Auto, 4x4, Power TT mirrors w/ marker lights installed, White, Full Tint, PendaPro SR,
Flowmaster Delta 40 series, open airbox w/ K&N filtercharger.

 

Thanks. I'll pull up the scuff plates and see
whats there. I have 2 small kicker speakers
I was going set behind the rear seat.

 

I did the same. You can see the speaker wire colors by pulling outward on the pillar panels without removing them. It won't help you to figure out polarity though.
Good luck

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1999 F250 SD CC, LWB, 5.4L, Auto, 4x4, Power TT mirrors w/ marker lights installed, White, Full Tint, PendaPro SR,
Flowmaster Delta 40 series, open airbox w/ K&N filtercharger.

 

Spaceace, are you speaking of the rear panel
where factory speakers would be? ( where
the seatbelts roll up )

 

yes

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1999 F250 SD CC, LWB, 5.4L, Auto, 4x4, Power TT mirrors w/ marker lights installed, White, Full Tint, PendaPro SR,
Flowmaster Delta 40 series, open airbox w/ K&N filtercharger.

 

I think when the trucks roll in the line they are wired all the same.