Dan,
When the bulbs are burning they are pulling current through the flasher
unit. It's a sort of thermostat that senses the heat caused by the flow
of electricity to and through the bulbs. It heats up to a certain temp,
then opens its points (the click you hear), cools, then points close and
current flows again until it heats and cycle repeats. When it is not
opening (lights stay on) you know that there is little current being
pulled through the circuit.
Cause of low flow is generally high resistance, such as loose
connections, corroded sockets, bad grounds, etc. Another cause that is
less obvious is that one or more of the bulbs themselves are not the
right bulb. Incorrect bulbs can work fine when everything else is OK, but
can lead to this slow flashing when voltage is low, as it is when lights
and heater booster are working.
So, I would suggest opening all lamps, cleaning the bulb sockets and
bulbs themselves, and inspecting & cleaning all connections you can find.
While the bulbs are out, check their numbers against the bulbs specified
in the handbook. Also, remove and clean all fuses and their holders,
while you are at the task.
It's a simple solution, but finding the specific problem may take some
time.
Bob
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