viper 5704 alarm 1st alarm attempt

Don't follow that diagram, follow mine, it's colour coded to your alarm and your car.

I got it to work. I followed your diagram to the tee without using the light blue wire from the car's factory harness. It works great. ThanksWiseman118

There is one more thing, a different issue: On my car, I have a factory tach that is digital / electronic. It worked fine before I got the alarm installed, but after the alarm was installed, the tach does not function (which normally has vertical bars that move left to right indicating 0 to 6000rpm range). After the install, the tach only has one vertical bar that lights up, indicating 0rpm and that's it. (no movement to the right, no rpm readout except 0 (which only let's me know that the tach has power). I guess that a wire from the alarm was wired into the factory tach wire and it pulling voltage away from the tach readout (just my guess). Do you have any ideas of why this is happening and any recommendations of how to fix my issue? Thanks!Wiseman118

Doubt if it's the alarm, GM digital dashboards are notorious for failure, especially when 24 years old! Tach should be picked up at distributor, PURPLE / white or white. The alarm WILL NOT pull enough from the tach to affect it.

I just installed this new tach part into the car a couple months ago, it is a separate stand one part that you can buy and replace by itself. Yes, the alarm uses H2/23 (violet/white) wire for the tach input. I will look to see where it is connected at near the coil/module and make sure that the H2/23 is connected to the PURPLE / white or white wire as you mentioned. The autostart feature is hooked up and working correctly, so if the tach wire (H2/23) is hooked to the wrong wire, will the autostart feature still work?Wiseman118

I think I see what's wrong, it (wire from the alarm) is installed (sliced) on a grey wire that is attached to a green wire near the alternator. When I researched it, it says that the green wire is a tach wire that can be used to give an aftermarket gauge a tach reading. When I disconnected the tach wire (from the alarm) that was installed (sliced) to the grey wire, my dashboard tach started to function correctly.Wiseman118

Tach issue resolved. I removed the Alarm tach wire from the grey wire near the alternator and attached it to the white tach wire going to to the CCCI module. Works perfectly and my tach is working just fine.Wiseman118

Howie,    I hooked the trunk trigger up exactly per your diagram and works just fine. I hooked attached a ground wire to the light and attached to the light blue wire from the alarm. I am having 1 more issue: 1. Does the hood trigger work (install the same way as the trunk trigger)? I hooked a ground wire to the hood light housing and attached it to H2/17 (grey wire) TRUNK PIN / INSTANT TRIGGER INPUT (N/C or N/O) (-). It is not triggering the alarm when I open the hood. Does the normally open/closed make a difference? I believe the default is set as normally open. Wiseman118

Install a new hood pin to the grey wire, leave it NO (NC is for Ford and Mazda). Honestly if the original installers didn't install the trunk and hood triggers, I don't think much of them, they did half a bloody job.

I installed a new hood pin and everything is finally working. The alarm rework in finally complete Yes, I will agree, they did one sorry job. This is why I took things into my own hands and completed everything myself. Thanks for your help.Wiseman118