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89 mustang alarm install to lock and unlock

  • Thread starter Thread starter jk66
  • Start date Start date Apr 9, 2026
J

jk66

New Member
May 21, 2023
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Apr 9, 2026
#1
  • Apr 9, 2026
  • #1
Hi, I have a 89 mustang gt I'm trying to wire up the viper 3105 alarm to lock and unlock with the remote. Ive read a few sites talking about the 5 wire relays, but it's not working. When I wire it up as soon as I attach the 12 volt positive the locks lock. Can anybody tell me how to wire this up correct? ive tried this way so far. @2spdt relays. 87,86 on one, 85 on the other 12 volts positive. on the lock relay 30 to the lock 87A to the switch and 85 to the wire from the alarm. the the unlock is the same except 86 goes to the alarm. This is how I wired it and it was called 5 wire 12 volt power door lock. does anybody have a way that actually works. Thank u.
 

AeroCoupe

lube between the nut and the face. I know my lubes
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#2
  • Apr 9, 2026
  • #2
G

Thread 'Alarm install question'

Apr 16, 2005
89 GT
I'm trying to install a key less alarm. The alarm has the basic two wire switching output +/- on lock and -/+ on unlock. I realize that the stock power door lock system is a reverse polarity. I've lost my mind meesing around with it and can't figure out how to wire it in. Any help would be appreciated.
  • GTConv
  • Replies: 6
  • Forum: Fox 5.0 Mustang Tech
 
J

jk66

New Member
May 21, 2023
12
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3
Apr 9, 2026
#3
  • Apr 9, 2026
  • #3
Thats the way I tried to wire it and it doesn't work. As soon as you connect 12 volts positive it locks the doors.
 

AeroCoupe

lube between the nut and the face. I know my lubes
Founding Member
Oct 28, 2001
5,919
4,040
183
Claremore, OK
Apr 10, 2026
#4
  • Apr 10, 2026
  • #4
Dumb question but the locks work just fine otherwise, correct?
 
J

jk66

New Member
May 21, 2023
12
1
3
Apr 10, 2026
#5
  • Apr 10, 2026
  • #5
yes I'm just installed a alarm and ive been trying to wire up two relays to get them to work with the new alarm.
 
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