Quote:
Originally Posted by Neel
........Test lights.. If you must use a test light, buy one that has high impedence.. A regular test light plugged into a computer circuit can cause more damage than the cost of a good multimeter..
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Some folks insist on using a regular test light (incandescent bulb) to troubleshoot. That's fine if there isn't a low-voltage ECU within sight. Potential is high to let smoke out of the system in the hands of an inexperienced tech.
OTOH, a high-impedance LED test light is pretty safe, with some caveats:
TechOne: Basic automotive service ... - Google Books
Sherwood