15
FUSE BLOCK
The Painless harness contains an 8 circuit fuse block that uses modern ATC
blade style fuses. This fuse block allows the convenience of having both flashers (turn
signal and hazard), as well as the horn relay, to be mounted in one location.
Horn Relay
On the fuse block you will find a horn
relay, which replaces the factory core
support/firewall mounted horn relay found
on older vehicles. The fuse block mounted
horn relay uses a standard 30 amp SPST
relay and is ground activated from a wire in
the Turn Signal Switch group of wires of the
fuse block harness. Replacement relays for
the horn relay can be found at any auto
parts store or by ordering
Painless part
number #80131
.
Flashers
The two flashers simply switch
power off and on going to the turn
signal switch and hazard switch. The
flasher found next to the horn relay is
the hazard flasher. The flasher on the
side of the fuse block by itself is the
turn flasher.
How a flasher functions is
simple. Power is switched off and on
according to heat built in the resistance wire inside the flasher. As soon as power is
drawn through the flasher, as when the turn signal or hazard switch is activated, the
resistance wire heats up and makes contact with the output side of the flasher. This
contact passes power through the flasher, into the switch and to the turn signal lamp(s).
Once this contact has been made, the resistance wire is no longer resisting any voltage,
so it begins to cool; this cooling causes the flasher to lose contact.
This loss of contact means that there is no longer any voltage going to the
switch, causing the turn signal light to turn off. Once contact is lost, the resistance wire
begins heating up and the entire process starts over again until the turn signal switch or
hazard switch is disengaged.
Some L.E.D. turn signals do not draw enough
voltage to activate a typical thermal flasher. If you are using
L.E.D. turn signals, and your turn signals do not work
properly and you are certain everything is connected
properly, a no load flasher will be required; Painless
part
number #80230
.