89 Mustang Ungo Door Locks?? Blowing Fuses

If your relays' terminals were labled correctly and your description of how they're wired is accurate, then check your relays. At no time, ever, should 85, 86, or 87 come in contact with 87a internally, and 87a should be the one and only wire tied to ground (through the 5-wire switches). Not only that, but at idle (relays at rest with no voltage between 85 and 86), your 87 pole should be wide open (not connected to anything), and the side of the 85/86 coil opposite the 12V source will either be wide open as well, or will have close to 12V on it.

If you've wired them up EXACTLY as you said, and that fuse is blowing the instant you tie the relay pack to 12V, and the relay pack is the ONLY thing you're hooking up at that time, then all signs would tend toward a bad relay. More common, however, is the tendency to accidentally reverse 30 and 87, which would then be sending 12V through pole 30, thus instantly providing a dead-short path to ground. Basically, plug each relay in one-at-a-time to see if you have a bad one. Otherwise... "shall i schedule an appointment?" (heh heh).

  q;^)

teknishn

the factory door locks are reverse polarity 5 wire alternating positive not 3 wire neg. if you had a honda then you would simply wire from the alarms NEGATIVE door lock outputs and tap into the cars NEGATIVE system.  the relays are used to change the negative outputs to positive ones.  Remember the lock and unlock wire should show continuity to ground when tested.  if a fused power wire touch a ground it blow the fuse.  Try connecting the alarms lock output to the 85 pole on the first relay then the unlock to 85 on the second relay.  Then use the two 87 and the two 86 poles for constant power.  87s from switch and 30 to motor legs.  this worked on the last ford I did.

I know what your going through good luck. Hope you get it.