do these usually fail after 6-7 years I have it controlling my high and low beams and my lights will turn off for about 30 seconds then come back on

sounds like you maybe running more current than the relay is design for. A head light on a car can use 20 amps or more. Two lamps and you would be over the 30 amp rating.

I bought this b/c I need to run one remote 12v wire from my car stereo to several car amplifiers. Does it matter what terminal I use for each wire?

Your "supply" wire (Fused 12v from the battery directly typically) is going to always go to terminal 30. Your "output' wire will be terminal 87 to all of your amplifier remote on terminals. 85 and 86 are your switch path where one will get positive 12v (stereo output remote on trigger wire I believe) when you want to the relay to connect 30 to 87, and the other will get grounded.

ASIN	B000P61E36
Brand	Install Bay
Brand Name	Install Bay
Connector Type	Screw
Contact Current Rating	30 Amps
Contact Material	Silver Alloy
Contact Type	Normally Open
Country of Origin	USA
Current Rating	30 Amps
Customer Reviews	4.3 out of 5 stars 180 Reviews
Global Trade Identification Number	00086429006557
Item Weight	36 g
Manufacturer	INSTALL BAY
Maximum Switching Current	30 Amps
Model Number	E-123
Mounting Type	Install Bay
Operation Mode	Automatic
Part Number	E-123
UPC	617407323412 086429006557 041114288748 163121248574
Wattage	360 Watts

Metra Install E-123 Bay Tyco Relay 12 Volt 30 Amp Each

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