05-20-2021, 03:34 PM | #5 |
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Join Date: Jul 2008
Location: Eastern Oregon
Posts: 2,300
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Re: 1972 GMC Headlights
I have a GMC with H4 halogen bulbs inside Hella units. You definitely need relays to operate all four, IE high beams. Without relays the internal headlight switch overloads...
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71 C-20 07 Magnum RT AWD |
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