problem, or unit itself?

Solder, solder, solder!  There is no substitute!

Best way to solder is to put something to cover yyour rugs so that it doesn't get burn and then buy a converter to plug in to the cigg lighter and plug your   solder if you don't have any outlets near by and solder away, buy a bright light so you can see in those akward positions,

Jeff,  (-) Mulitiplexed input, Zone 4  to and Optional Sensor, what can I hook that up to?

CPGOOSE  

where did you connect these wires on your 550ESP viper alarm, if you have the manuals, look this up  1.  H3/1 BLue (-) status output     2.  H3/2  Blue/Black (-) optional third igintion output, where the hell is the third ignition output,  thanks dude, All most done with this fun installation of my alarm,   JOEL                                                                                                            

well, to tell you the truth it's been a few months, so I can't remember if I just taped those up or if they had to be grounded.

1.  H3/1 Blue - This alarm wire outputs a negative signal when the remote starter is engaged.  It's used to do things like shut down a sensor.  I didn't need to use it, but I can't remember if I grounded it or if I just taped it up.  Probably just taped it. 

2.  H3/2 Blue/Black - It's the alarm's optional third ignition output.  If our cars had a third ignition wire, then we would need this blue/black wire to hook up to the third ignition wire.  We don't have a 3rd ignition wire, though, (we only have 2), so I didn't use this wire.  I'm pretty sure you can just tape it off.

I'm sure someone can say whether these 2 can either be taped or if they have to be grounded.  I just can't remember what I did, I just know i didn't need them.

Well I use FLUX, it's a type of lube that I put on the wires.   When I solder, it intends to spread out around the area I solder, instead of just having a big chunk  of solder on one area. They should have it at the hardware store where you can buy a soldering gun,  then try to wrap the wire's with 3M electrical tape so it looks like the factorys wiring, so that the thiefs don't know where the brains at to cut when your alll done with the procedure's,  GOOD LUCK "BOYMATA"

CPGOOSE  Thanks for the info, That's good enough for me. I try again on the system this weekend ,   You too    " JEFF"  Thanks Again

Try using a cordless soldering iron... I know it's more expensive, but you don't have to wait for it to heat up as long and it's alot easier to use. Solder all connection that are not soldered for a trouble free installation.