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Howie, I have never heard of anybody setting an airbag off with a test light..(anybody I know personally)  But I can tell you that the airbag deployment circuit reads around 4 ohms, so when you use a makita battery to figure out which speaker wire you have, you do hear a sound from all sides and corners of a Range Rover.

Huh? Another one after my own heart, hate those muppets with their AA batteries, personally I use the radio harness constant and ground, just need spare fuses, mind you a Snap-On test light is safer, N.B. All this pussyfooting, any one remember 90s BMW 5/7 series, with all the inherent electrical noise they had? It's alright taking precautions and preparation but how anal do you want to get?

no more 'n 3 or 4 inches, I reckon-

Ha Ha I'm now going to buy Snap-On shares so I will "insert" (Oldspark isn't the only one with terrible puns) Snap-On incandescent bulb testers into every post. Just did it with a cellular query.

Gentlemen PLEASE - for PETE's sake!!!! 7.5 to 10 centi-meters!!! What are we? American? Besides, it sounds bigger. PS - Ouch. PPS - I did mention LEDs etc. Hi-impedance. (Down here we use domestic bulbs, though curly CFLs are proving popular.)