Not yet speedy..... and @rocket_troy A 1W test lamp would test that you had enough current to guarantee firing an igniter. Unfortunately, that's not what you are testing for. What you are testing for is "is there any voltage present with sufficient minimal current to accidentally set off an igniter?" That is if I connect an igniter to these leads, will they potentially exceed the MINIMUM SAFE CURRENT for an igniter. That level you test for should be the level for the MOST CURRENT SENSITIVE igniter you will connect.I can build that
In this case, The power source is close to the pads on a remote box, so it's not a long lead and the test is performed at effectively the relay output, or first bit of wire connector after. If it were 100m of wire with a switch and a battery at the firing end it would be more tricky.
What are those numbers? Well, read the data sheet for the ematch or igniters you may use and pick the lowest. A 1W bulb is NOT SENSITIVE ENOUGH.
PM me if you want to discuss it. This thread is going off topic.
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