polarity of horn for 95 camry...?

[tigerlegend2000]

i tried to put on a remote start and alarm combo... basically, everything all set... just wonder anyone know the polarity of the horn in the 95 camry...? accroding to the install manual, it green/black @ the steering.... i checked it but it has no power... i found aother wire (very tiny) which is green that has 14v + constant... when i honk, it dropped to 10.6v so is this the right wire and do i need a relay for this? (i tried to hook up this wire with the wire from the alarm module but it was not honk anyway)
Any input?.... thanks in advance.....

[88 LE]

green/black wire at the steering column.

Its a negative trigger.