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To keep lo beam current from going to hi beams.... (archive)

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Posted by Erik Brannfors - Seattle M3 on February 25, 2002 at 10:40:03:

In Reply to: I don't understand what the diodes are for?? posted by Ari on February 25, 2002 at 02:22:03:

My car was originally fitted with an H4/H1 setup, then converted to a 9005/9006 setup. With the latter, the lo beams would switch off when the hi beams came on, as the system was set up for a dual element lo beam to have the 2nd element get power from the hi beam circuit.

The H1/H1 system, of course, is all single element, so to get the lo beams to come on with the hi beams, one must tie the lo beam circuit into the hi beam circuit downstream of the hi beam lamps. So, the diodes keep the power from the lo beams from flowing back upstream to the hi beams.

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