Question for 105.21 Bertone owners.

**papajam** · #1 (**permalink**) 12-14-2003, 06:46 AM

The wiring diagram I'm using as the basis for the diagram I'm drawing for your car shows H1 bulbs for both the dipped and main beams. The '72 parts book I have shows H4 bulbs (combined dipped and main beams) in the larger outer headlights. So the question is, is the use of either H1 or H4 bulbs because of a specific market or was there a design change during production?

ossodiseppia · #2 (**permalink**) 12-14-2003, 09:30 AM

Weren't the H1 bulbs for the US market? Could you be looking at a US Spec owner's manual and a Euro spec parts book?

**papajam** · #3 (**permalink**) 12-14-2003, 11:02 AM

To my knowledge, all US 105/115 GTVs had DOT sealed beams and the rest of the world got H1/H4s. The headlights in question were fitted to non-US 2l Bertone GTVs both left hand drive (105.21) and right hand drive (105.22). The diagram I'm using is, I believe, for a U.K. market car (105.22) that came from a non-US version repair manual. The parts book is a 1st edition (1972) Euro 2l GTV and Spider.

**papajam** · #4 (**permalink**) 12-18-2003, 10:08 AM

OK, how about this question. What type of bulb does the large, outer headlight of your 105.21/105.22 have; an H1 or an H4?

**tubut** · #5 (**permalink**) 12-18-2003, 12:34 PM

Papajam,

I believe your question arose because of technical evolution, not regulation or marketing. It appears H4 twin-filament light bulbs were not manufactured in large quantities before 1971 (see http://www.hellausa.com/maineng/NewLook/about/1961.html). So, there may be a transition period where early cars had H1 lights and later cars had H4 lights, possibly available as an option first before they were adopted as standard equipment.

Ruedi

Rocketjosh · #6 (**permalink**) 12-19-2003, 05:04 PM

Hey Jim,
When are you gonna make us (me) a diagram for a 71 GTV? I'm sure others (me) on the BB would appreciate it

.

Cheers,
Josh

**papajam** · #7 (**permalink**) 12-19-2003, 05:13 PM

OK, Josh. Your next!

wolf · #8 (**permalink**) 12-20-2003, 10:48 AM

I have H1 bulbs for both the dipped and main beams.
Wolf
2000GT Veloce (Euro)
1973
10521

**papajam** · #9 (**permalink**) 12-20-2003, 11:43 AM

Thanks for the responses and because of them, I found out the following;

1. Series 1 Euro 1750 GTVs have dual filament bulbs in the large outer headlights that are known as 'Bilux' bulbs, not H4s as I had mistakenly called them. The Bilux bulbs (predecessor to the H4?)have a different globe shape than the H4s and I think the bases are slightly different too. The small, inner lights have H1s.

2. The Series 2 1750s and Euro 2l Bertone GTVs have H1 single filament bulbs in all 4 headlights (as confirmed by wolf).

So the 105.21/22 diagram is now complete and will be posted in the electrical diagrams of this BB shortly.

The bulb on the left is a Bilux; the right is an H4.