With remnants of a wiring fire Clive anything could have happened. It would mean tracing through all the wiring where the burn out occurred. Or get a loom from another truck but that may be tricky.
With remnants of a wiring fire Clive anything could have happened. It would mean tracing through all the wiring where the burn out occurred. Or get a loom from another truck but that may be tricky.
Sounds like weak relay contacts or the wiring from them. Or it could be a poor earth. You could check all the earths you can find and that way hopefully you'll have covered the one from the alarm. I would start by looking behind the glove box, then the drivers side, then under the centre box. I would take the door card off and check what happens when you lock by using the door lock. Then try the key and see what happens by trying to work pout which wires do what and following them. It's either that or a recommended alarm person. They seam to have a sixth sense on these problems.
Having skimmed this and did not see if you found the ECU? One thing that is common with a good quality alarm is the wire colours. If they are all one colour (usually black), this is indicative of a decent quality. When the unit is at the 'pre install' stage each has a coloured tag. Once the install is complete and tested the tag codes are cut off, thus making a quick bypass impossible. The only reason I mention this, is if the wires are good and also coloured then it may be the ECU failing, so a replacement may be on the way.
The 80 is a pain to wire the central locking activation with aftermarket alarms, I found this when doing my own install. The easiest way is via the door jamb which sound like your install, the wires tend to work harden and break, the result is intermittent operation of the CL. A trick I do is to open the door and operate the alarm lock button with the door open and in different positions. Some alarm systems detect the door is open via either the internal lock mechanism (unlikely on our 80's) or the switch for the interior light, so you may have to deal with them. Tape the switch down and move the mechanism latch to the door closed position using a screw driver.
Start swinging that door when pressing the button Clive!
regards
Dave
Result mate. Good old twist n tape lol, nearly as bad as a scotch lock.
Glad you got it sorted Clive that should save you some strange looks