Not a bad question. How many time did MOM say "don't touch that stove"
So it's a cool 86 degrees now, with a high of 108 +. I got up off MY butt and went out to the basic M998 truck with Fluke model 79 & Amp probe 80i - 110s to dooo a follow up to a burning question with science.
STOP, RUN, START switch. These measurements in series with the switch common (battery) and are ONLY switch currents.
In the OFF position, NO measurable current flow.
In the RUN position, 1.8 Amps flows to the PCB to energize master power solenoid. All other circuits are supplied from PCB to IP, heater, wipers, gauges, etc.
In the START position, 8.1 Amps, during starter solenoid energize. Momentary cranking time.
HumV switch circuit never takes on additional loads. IMO these figures with a quality switch are easy to handle, providing long term operation.
One may think they have a nice $76.99 switch with pretty wires, "plug and play" till that day... and POOF !! truck won't start. Read about it right here on SS POOF, POOF, POOF 3 or 4 time a year.
My observation is the start contacts burn due to a bit higher current flow of the underrated cheap switch.
AND more important... A large inductive arc of those contacts during starter solenoid engage / release. Switch not rated for
inductive loads. Google it.
Another kicker... not that water / dust proof, causing more of a chance to POOF. Cheap quality,, questionable specification, equals POOF. That's the science. POOF is the scientific word for blow out, over loaded, busted... screwed works too.
Some more numbers....
Lighting circuits do not flow thru switch above. They are their own separate circuit. Connection thru PCB to battery all the time.
Stop lights on, incandescent bulbs, 3 Amps
Marker / park only, incandescent bulbs, 1.8 Amps
Service lights + LED head lights low, 4.9 Amps
Service lights + LED head lights HI 6.2 Amps
Accessories......
Heater on HI, 5.7 Amps
Wipers on HI, 5.2
Total system draw at SHUNT (what's a that)
RUN 5.1 Amps Includes PCB & IP. NO other loading.
START 181 Amps Momentary cranking
GLOW WAIT 102 Amps Outside temperature 89 degrees, first time cycle.
Measured with all accessories off. IP fuel solenoid energized, cold advance off.
So there you GO some number to roll around in ones head.
Can I ask (that a trapping question) Ignorant not sure? Been there 18 month (how many times you flip it ?) Any idea on current? (has a meter) 24 volt rating (is that Chinzee or USA Volts)
Did I jump to a conclusion ? NO... jumped right in and shared data, figured it out.
Now its 105 and climbing & i'am getting hot around the collar.
Take it to the dealer next time, CAMO
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