Author Topic: 74 Eldo headlight  (Read 616 times)

Offline wirespokes

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74 Eldo headlight
« on: May 22, 2026, 12:19:21 AM »
I've just been inducted into the society of the Loop. I'm slightly off the bottom of the learning curve, so be warned, dumb questions forthcoming, no doubt.

The bike was a police model purchased new by the previous owner. Before he could take possession, the dealer removed all the police stuff. Then somewhere early on, it was painted blue and the touring package installed - Big fiberglass Vetter (probably Luftmeister), along with luggage and topcase and crashbars. All that stuff weighed a TON! That poor 850 must have really struggled lugging all that stuff down the highway and over the mountains!

Removal of the fairing means the headlight needs to be replaced - not even the bucket is there. A house wiring box was fitted in its place to house the wiring connections. Yeah, the harness is toast. Anyway, my question is what's needed to run an H4 in the stock headlight bucket? Will the stock headlight ring work or will I need something different?

Are all of the Ambo and Eldo headlight buckets the same? Or were some of them not as deep?

MG Cycle sells a headlight bucket and says it's a cheap alternative to stock. Is it inexpensive but good quality? Or should I watch for an original?

Online cliffrod

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Re: 74 Eldo headlight
« Reply #1 on: May 22, 2026, 05:37:19 AM »
I know the early V700 headlight bucket is a lot longer/deeper than the later Ambo-Eldo headlight buckets I have. I don’t know if Ambo-Eldo buckets vary in dimensions.  You can use a different headlight bucket.  It depends upon how much of the oem electrical wiring and components you plan to locate inside the bucket.  I would try to find an original one, especially one with most of the electrical guts intact, instead of trying to reinvent the wheel.
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Offline guzziart

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Re: 74 Eldo headlight
« Reply #2 on: May 22, 2026, 08:26:46 AM »
Maybe Harpers or Moto Guzzi Classsics has a good used bucket, etc.  FWIW, I was able to install one of those inexpensive "jeep" style LED headlights into the stock Eldo bucket on my Eldo.
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Online Antietam Classic Cycle

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Re: 74 Eldo headlight
« Reply #3 on: May 22, 2026, 09:35:23 AM »
Removal of the fairing means the headlight needs to be replaced - not even the bucket is there. A house wiring box was fitted in its place to house the wiring connections. Yeah, the harness is toast. Anyway, my question is what's needed to run an H4 in the stock headlight bucket? Will the stock headlight ring work or will I need something different?

Are all of the Ambo and Eldo headlight buckets the same? Or were some of them not as deep?

MG Cycle sells a headlight bucket and says it's a cheap alternative to stock. Is it inexpensive but good quality? Or should I watch for an original?

Greg Bender can fix you up with a new harness (and switches, fuseblock, etc.). Well worth the $$.

V700 and the earliest Ambos had the deep bucket, shallow bucket later. A Loop doesn't look right with some cheap aftermarket headlight - find an original. I was just talking to Mark at Moto Guzzi Classics - he has one. He most likely has the fuseblock and terminal board that go inside as well. New headlight rings are available from Motorwest:
https://www.motorwestmotorcycles.com/shop/index.php?main_page=product_info&cPath=13&products_id=225

A lot of H4 headlights are too deep for the shallow bucket and the plug will interfere with the fuseblock. One can remove the terminals from the plug, bend the tangs of the headlight/bulb out and connect them individually to get around that. I've been fitting this LED sealed beam headlight: https://www.amazon.com/dp/B0BNT4V2VC Current draw is much lower than a halogen bulb, so no need to wire in relays to prevent melting the fuseblock or headlight switch.
Charlie

Offline wirespokes

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Re: 74 Eldo headlight
« Reply #4 on: May 22, 2026, 09:49:51 AM »
Considering that I'm starting over with the wiring and no headlight, it's a clean slate. Should I recreate it like stock, even though having all the harness flexing with each steering movement isn't a good idea, and Guzzi abandoned that idea the next year. Or should I make it better and run the wiring back by the rear fender? My G5 came with the Moto Gadget and I've grown to like it. Sure makes wiring easy, so I'm considering going that route.

A trip to LA, and Guzzi Classics, is planned, and should have happened already but for other circumstances. I'll have to contact Mark and get his input. I agree, the loop needs the correct headlight - it just wouldn't look right without it. Thanks for the input Charlie.

Online Antietam Classic Cycle

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Re: 74 Eldo headlight
« Reply #5 on: May 22, 2026, 10:40:31 AM »
Considering that I'm starting over with the wiring and no headlight, it's a clean slate. Should I recreate it like stock, even though having all the harness flexing with each steering movement isn't a good idea, and Guzzi abandoned that idea the next year. Or should I make it better and run the wiring back by the rear fender? My G5 came with the Moto Gadget and I've grown to like it. Sure makes wiring easy, so I'm considering going that route.

A trip to LA, and Guzzi Classics, is planned, and should have happened already but for other circumstances. I'll have to contact Mark and get his input. I agree, the loop needs the correct headlight - it just wouldn't look right without it. Thanks for the input Charlie.

Greg uses wire that is meant to flex in his harnesses. I've never seen a Guzzi where at least part of the harness doesn't flex with steering movement. The harness of a (civilian) Loopframe is so simple, I don't see the need to attempt to make even more so.

I've never understood why anyone would use the Motogadget crap on anything other than a stripped down bobber, cafe', etc. For a touring bike ridden in the real world, it just doesn't make sense to me. You pretty much have to use their switches as well. I've seem more than a few fail. $300 that could be better spent elsewhere. Just my opinion.

Here's Greg's main harness, which costs only $96. Doesn't get much more simple.


Charlie

Offline Cam3512

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Re: 74 Eldo headlight
« Reply #6 on: May 22, 2026, 03:26:59 PM »
Let’s see some pics of the Eldo Terry?
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Offline wirespokes

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Re: 74 Eldo headlight
« Reply #7 on: May 22, 2026, 08:52:06 PM »
Charlie - I agree on the motogadget switches. My G5 came with them, and even though they worked, they were impossible to use. For one, they were both, left and right, two button when one of them really needed to be two. And expensive??? Crazy expensive for some little buttons. However there is a menu option to make the unit work with Japanese or European style switches, otherwise I would have tossed the whole thing. it has all the fuses and relays in that tiny package, plus an alarm that works. And it does simplify wiring. When you say you've seen them fail, do you mean the switches or the electronic unit itself? Any guess on the cause if it was the electronics?

The bike is a police, not civilian, but not having a siren, police lights and all that, I don't see why the civilian harness couldn't work. But what do I know?

Right now I'm exploring all options since it's essentially a clean slate.  I like things simple and durable. I like points on these bikes since they last and don't fail suddenly like electronic ignition. Replacing points every three or four years isn't a problem. 

It's a cool bike and don't want to cobble it up. It might not look new and shiny, but must look decent and it's gotta be reliable and everything work well.

The last thing done five or ten years ago was the clutch by his son - the guy who sold it to me. I have a feeling I'll be going in there - the bike hasn't been started, but it's my gut feeling. I think just about all of the 8 guzzis I've gotten in that many years have needed something in the clutch department.

I'll have to take some new pictures - the few I had got deleted. The bike was a mess when I got it, and spent two or three days just cleaning it up. Still doesn't look the greatest, but at least it's not grubby.

Online Antietam Classic Cycle

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Re: 74 Eldo headlight
« Reply #8 on: May 22, 2026, 09:12:18 PM »
Charlie - I agree on the motogadget switches. My G5 came with them, and even though they worked, they were impossible to use. For one, they were both, left and right, two button when one of them really needed to be two. And expensive??? Crazy expensive for some little buttons. However there is a menu option to make the unit work with Japanese or European style switches, otherwise I would have tossed the whole thing. it has all the fuses and relays in that tiny package, plus an alarm that works. And it does simplify wiring. When you say you've seen them fail, do you mean the switches or the electronic unit itself? Any guess on the cause if it was the electronics?

The bike is a police, not civilian, but not having a siren, police lights and all that, I don't see why the civilian harness couldn't work. But what do I know?

Right now I'm exploring all options since it's essentially a clean slate.  I like things simple and durable. I like points on these bikes since they last and don't fail suddenly like electronic ignition. Replacing points every three or four years isn't a problem. 

It's a cool bike and don't want to cobble it up. It might not look new and shiny, but must look decent and it's gotta be reliable and everything work well.

The last thing done five or ten years ago was the clutch by his son - the guy who sold it to me. I have a feeling I'll be going in there - the bike hasn't been started, but it's my gut feeling. I think just about all of the 8 guzzis I've gotten in that many years have needed something in the clutch department.

I'll have to take some new pictures - the few I had got deleted. The bike was a mess when I got it, and spent two or three days just cleaning it up. Still doesn't look the greatest, but at least it's not grubby.

Failures I've seen were to the control unit itself.

If the ignition switch is on the left under the seat and you have the police dash, then while the main harness is similar, there are sub-harnesses that are completely different or not used on a civilian Loop. Police Loop wiring is quite a bit more complicated than civilian and more time consuming to install. I just finished rewiring my own police Eldo and while it went well, and everything worked first time, it's not something I want to do again any time soon. ;-) Mine has police signals, spot lights and a siren (came that way so I left it).









The original set of points in my '69 Ambo lasted 46 years and 98k miles. Bosch Distributor Grease on the lobes will help them stay in adjustment a very long time. 
Charlie

Offline wirespokes

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Re: 74 Eldo headlight
« Reply #9 on: Today at 01:26:28 PM »
That's kinda scary if the control unit fails! What a mess that would be! I wonder if a 30amp breaker to the unit would help prevent that? Reason I say that is because the G5 came to me with the motogadget, and it's been working fine the last 10 thousand miles.

That's a very cool bike Charlie! You'll be getting stopped by the police just to get a photo with you. Don't wear a white half helmet. LOL

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