Has anyone checked the amperage draw on the H4's? I bought a set of the
7" lights from IAP which use the HB2 bulbs. Before I installed them I checked
the amperage draw and was surprised to find it about a half amp less on each
element than the Sylvania extra bright sealed beams that I took out. I
already have relays installed and just wanted to make sure they would handle
the new load. I was pleasantly surprised when I discovered that the load was
actually less. (4 or 4.5 amps vs. 5 or 5.5 if I remember correctly)
I also discovered by way of a melted switch that the relays only work the
headlights. The parking lights, dash lites, back up lites, etc all come off a
separate wire and thru a separate fuse. An intermittent short in a back up
lite wire at the transmission housing will kill that switch without blowing
the fuse. No, don't ask how I know ;-) Now I gotta go add another relay.
Skip Patnode
'67 Duetto
Norfolk, Va.
Date: Thu, 9 Dec 2010 09:30:59 -0600
From: "Carl R. Davis" <[email protected]>
Subject: [alfa] Re: More light Weirdness
>> Got a '73 Alfa Spider, US spec. Etc.
It's the H4s! You didn't say you added high and low beam relays when you
added the H4s, so I assume you didn't. For the second time you have burned
up the contacts in you headlight switch. These switches were marginal for
the current draw of normal headlights; they were never designed to handle
the draw of high powered headlights.
Carl R. Davis
2823 S. Rocky Hill Road, Galena, Illinois, USA 61036
750E, 750F, 10121, 105.62, 115.01, 115.41S4
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