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
Best Sellers Rank	#992,596 in Automotive ( See Top 100 in Automotive ) #502 in Automotive Replacement Starter Relays
Brand	Install Bay
Coil Voltage	12 Volts
Connector Type	Plug-In
Contact Current Rating	30 Amps
Contact Material	Aluminum
Contact Type	Normally Closed
Current Rating	30 Amps
Date First Available	August 20, 2007
Department	Electronics
Is Discontinued By Manufacturer	No
Item Weight	1.28 ounces
Item model number	E-123
Manufacturer	Metra Electronics
Maximum Switching Current	30 Amps
Maximum Switching Voltage	12 Volts
Minimum Switching Voltage	12 Volts (DC)
Mounting Type	Screw Mount
Number of Terminals	2
Operation Mode	Automatic
Product Dimensions	3 x 3 x 1.13 inches
Specification Met	ABS
UPC	617407323412 086429006557 041114288748 163121248574
Wattage	360 watts

THE INSTALL BAY Metra E-123 Tyco Relay 12 Volt 30 Amp Each

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