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relay could be completely bypassed in this configuration. Similarly, the 2-ampere ATM fuse and fuse
holder included in the fuse kit are not needed.
CAUTION
Because the “hot wired” configuration renders the function of the Time Delay Relay
useless, the Control Head will draw substantial quiescent current continuously from
the battery when turned off. For this reason, the “hot wired” configuration should only
be used in highly-controlled or temporary situations.
NOTE
A software configuration parameter can be set to disable the function of the Control
Head’s on/off power button. This may be desired, for example, where frequent contact
with the button is unavoidable and detrimental to usage.
8.2 POWER INSTALLATION PROCEDURE
Prepare to connect battery power to the radio through the vehicle’s engine firewall. Plan the wire route
carefully, using an existing access hole through the firewall if possible. Alternately, drill a new hole
approximately 3/8-inch in diameter and install a small rubber grommet to protect the wire from chafing
on the hole’s sharp metal edge. To prevent fumes from entering the passenger compartment, this
hole/grommet/wire combination must also be sealed with a silicon-based sealer before completing the
installation.
8.2.1
Install Main Fuse Holder, Time-Delay Relay, and Fuse Block
Refer to Figure 8-1 and Figure 8-2 for parts included the radio’s fuse kit. Follow the steps below for
connecting the radio to the vehicle’s positive battery power. Also refer to the respective wiring diagram at
the end of this manual.
CAUTION
Do
not
install the fuse holder, wire, and relay over or in the near vicinity of the engine.
Excessive engine heat can cause permanent damage to these components and can lead
to intermittent electrical connection to the battery.
WARNING
Before making connections to the battery’s positive post, carefully disconnect the
battery’s negative (ground) cable. This will prevent tools or other metallic objects
which come in contact with the battery’s positive terminal from shorting to
vehicle chassis ground, causing sparks or even a fire or an explosion! When
disconnecting the negative cable, cover/insulate the positive post if it is not
already so a tool cannot short between the posts.
A fuse must not be installed in the main fuse holder until all wiring is complete.
This will prevent the unit from powering up prematurely and/or causing an in-
rush of current that could lead to shorting of the battery, sparks, or even fire.
1.
The installation’s main ATC Fuse Holder is a part of the Fuse Distribution Rail Kit (part of Item 2 in
Table 4-1). Strip one of the ATC Fuse Holder’s wires and crimp a 3/8-inch ring terminal to it. Ring
terminals are also included with the kit.
2.
Verify the fuse is NOT in the Fuse Holder.