Star Headlight & Lantern 7400 Star Lase - Manual (Page 14)

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Checking multiple non-working strobe or LED heads:
If two or more of the heads connected to the same switch are not flashing, follow these
steps to determine the problem:
1. Check that the bar is grounded properly as explained on the previous page.
2. Check all fuses, including those at the battery, at the switch panel, and in the dash (if
applicable). Remove these fuses, and check them to confirm they have not blown.
Replace any blown fuses with only fuses of identical values. Replacing the fuse with
the wrong rating may damage your pack and/or vehicle, and will void your warranty.
3. Check that there is NO VOLTAGE on the Red w/Green Stripe wire (Pattern Select
wire). Measure the voltage at the terminal block between the Red w/Green stripe wire
and a good chassis ground. If there is voltage being applied to this wire, it will prevent
the heads from flashing.
4. Check the power on the red power wire and the corresponding control wires at the
terminal block as explained on the previous page. If sufficient voltage is not reaching
the terminal block perform the following tests:
a. With the vehicle turned off and while the pack is running, measure the battery
voltage at the battery. A nominal 12.5 volts should exist. Note this voltage. If this
voltage is below 10.0 volts the bar will not function properly and the problem is
with the battery. This reading should not be more than 1-1.25 volts higher than
the reading taken from each wire at the terminal block. If there is an excessive
difference then continue on to the next step.
b. With the vehicle not running and the lightbar on, measure the voltage in the red
wire by taking a reading from the positive side of the battery to pin 1 of your
switch. If this reading exceeds 0.25 volts then there is a poor connection between
the switch and the battery in the red wire and it should be checked.
5. If the leads in one of the heads have shorted out, the output voltage of the other
heads may be held down as well. To test for this, unplug all of connectors for all of
the faulty heads at the Connector Board, and plug them in individually, one at a
time. If your problem is a result of a shorted head (or harness), then the other heads
should function properly if the faulty head is no longer connected. Note: A burned out
strobe tube does not cause a short and will not affect the operation of the remaining
heads.
6. If the problem is with one of the heads and/or mini harnesses, try that non-working
head in a different location to determine whether it is the head or harness that is bad.
7. If the problem is not with a shorted head and if proper voltage is reaching the terminal
block, then the problem is most likely internal to the “T” shaped Connector Board.