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<blockquote data-quote="stones" data-source="post: 991663" data-attributes="member: 540734">(cut and paste)5.11&nbsp;&nbsp; How many devices can I attach to my remote turn-on lead? [iDB]=======================================================================The remote turn-on lead that most head units will not provide very muchcurrent (usually 250-300mA), so there is a limit to the number ofcomponents you can activate with it.&nbsp; Generally, it is safe to hook uptwo devices to the lead without having to worry about problems.However, if you&#039;ll be activating more components, then you shouldprobably use a relay.[CODE]5.12&nbsp;&nbsp; How do I wire a relay in my system? [iDB]================================================There are two types of relays that are commonly used in 12-voltautomotive applications:&nbsp; Single-pole Double Throw (SPDT) relays, whichhave 5 pins, and Single Pole, Single Throw (SPST) relays, which have 4pins.&nbsp; Depending on the application, you can use either of these; forremote turn-on leads (see Section 5.11), an SPST relay is fine,SPDT relays are often used in alarm installations.&nbsp; Make sure that youget a 12-volt relay - this specifies the voltage required to make therelay &quot;switch.&quot;The connections on the two types of relays look like this:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; SPST&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; SPDT&nbsp; &nbsp; &nbsp; &nbsp; =====================&nbsp; &nbsp; &nbsp; =====================&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; (87)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; (87)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; +---------+&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; +---------+&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; |&nbsp;&nbsp; ---&nbsp;&nbsp; |&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |&nbsp;&nbsp; ---&nbsp;&nbsp; |&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; |&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; |&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; |&nbsp; &nbsp; &nbsp; &nbsp; (86) | |&nbsp; &nbsp;&nbsp; | | (85)&nbsp; &nbsp; &nbsp; (86) | | --- | | (87a - center)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; |&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; |&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; | (85 - right)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; |&nbsp; &nbsp; |&nbsp; &nbsp; |&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |&nbsp; &nbsp; |&nbsp; &nbsp; |&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; +---------+&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; +---------+&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; (30)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; (30)Pins 85 and 86 connect to the coil which causes the relay to switch.On both relays, pins 30 and 87 are normally disconnected.&nbsp; When therelay is activated (switched) pin 30 and 87 are then in contact.&nbsp; Thedifference with the SPDT relay is that in the &quot;normal&quot; state, pins 30and 87a are in contact.To hook up a relay (either kind) for a remote turn on, make thefollowing connections:&nbsp;&nbsp; *Pin 30*&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; +12 Volts (Battery +)&nbsp;&nbsp; *Pin 87*&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; Amplifiers&#039; remote turn-on terminal&nbsp;&nbsp; *Pin 86*&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; Head unit remote turn-on lead&nbsp;&nbsp; *Pin 85*&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; Ground&nbsp;&nbsp; *Pin 87a*&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; No connection (SPDT only)[/CODE]</blockquote>

[QUOTE="stones, post: 991663, member: 540734"] (cut and paste) 5.11 How many devices can I attach to my remote turn-on lead? [iDB] ======================================================================= The remote turn-on lead that most head units will not provide very much current (usually 250-300mA), so there is a limit to the number of components you can activate with it. Generally, it is safe to hook up two devices to the lead without having to worry about problems. However, if you'll be activating more components, then you should probably use a relay. [CODE]5.12 How do I wire a relay in my system? [iDB] ================================================ There are two types of relays that are commonly used in 12-volt automotive applications: Single-pole Double Throw (SPDT) relays, which have 5 pins, and Single Pole, Single Throw (SPST) relays, which have 4 pins. Depending on the application, you can use either of these; for remote turn-on leads (see Section 5.11), an SPST relay is fine, SPDT relays are often used in alarm installations. Make sure that you get a 12-volt relay - this specifies the voltage required to make the relay "switch." The connections on the two types of relays look like this: SPST SPDT ===================== ===================== (87) (87) +---------+ +---------+ | --- | | --- | | | | | (86) | | | | (85) (86) | | --- | | (87a - center) | | | | (85 - right) | | | | | | +---------+ +---------+ (30) (30) Pins 85 and 86 connect to the coil which causes the relay to switch. On both relays, pins 30 and 87 are normally disconnected. When the relay is activated (switched) pin 30 and 87 are then in contact. The difference with the SPDT relay is that in the "normal" state, pins 30 and 87a are in contact. To hook up a relay (either kind) for a remote turn on, make the following connections: *Pin 30* +12 Volts (Battery +) *Pin 87* Amplifiers' remote turn-on terminal *Pin 86* Head unit remote turn-on lead *Pin 85* Ground *Pin 87a* No connection (SPDT only)[/CODE] [/QUOTE]

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