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Starter Motor Burned |
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el__burro 
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Joined: 04 Aug 2018 Location: London UK Status: Offline Points: 499 |
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 Topic: Starter Motor BurnedPosted: 04 Mar 2024 at 18:02 |
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Good afternoon,
My V7 starter motor won't turn, It clicks, (the solenoid seems to do its job) but it feels like its stack on the gears. Plenty of juice in the battery. Not sure what it could be. I will remove it for inspection. In the meantime.. keep your suggestions coming Thank you el__burro
Edited by el__burro - 08 Apr 2024 at 18:39 |
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el__burro
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Brian UK
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Posted: 04 Mar 2024 at 20:07 |
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First, try this. Testing a starter motor. - Moto Guzzi Riders Forum
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Brian.
Better 5 minutes late in this world than years early in the next. |
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Brian UK
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Posted: 04 Mar 2024 at 20:08 |
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Then look at this. Click no Crank - Moto Guzzi Riders Forum - Page 1
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Brian.
Better 5 minutes late in this world than years early in the next. |
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Dave P.
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Posted: 05 Mar 2024 at 13:02 |
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With regard to the "Click no crank" problem this thankfully does not apply to the Loop frame models. Back then Guzzi wired the starter with the heavy current coming from the battery terminal so no big current going through the ignition switch. Why they changed that later on is a mystery.The "Testing a starter motor" thread certainly does apply.
As a matter of interest when did Guzzi start taking the heavy current to the solenoid via the ignition switch? I've looked at several of Carl Allison's wiring diagrams for Tonti models and they all seem to supply current to the solenoid directly from the battery. Have I misunderstood the problem on the later models?It wouldn't be unprecedented.  Edited by Dave P. - 05 Mar 2024 at 13:29 |
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TO LIVE OUTSIDE THE LAW YOU MUST BE HONEST.
1971 V7 Special. 1972 850GT. 1970 T120 Bonnie. 2009 500 Bullet. |
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Brian UK
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Posted: 05 Mar 2024 at 14:26 |
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Well as far as I can see, the V7 Sport 1971 and v850 1973 are the last ones fed direct from the battery. The '74 850T is fed via the switch and so far as I can see, it continued that way. Why, I will never know.
All the small blocks were fed via the switch too.
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Brian.
Better 5 minutes late in this world than years early in the next. |
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ranton_rambler
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Posted: 05 Mar 2024 at 17:07 |
That sounds about right. I did the additional relay modification on both my V50 Monza and Spada. My loop has never had any problems.
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el__burro
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Posted: 05 Mar 2024 at 17:48 |
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It looks like I fixed it..
 then I fucked it.. I cleaned it all with Dw40. Let dry over night, sprayed with air, tested and it worked great. I put it on the bike, started it a few times then got stuck again.(probably shortened). I guess something must have happened with the WD40 residues. Smoke starting coming out off it and "thankfully" it melted the big red wire to the battery. Unless any of you can suggest a miracle fix.. I guess its Game Over for this motor.. Need a new one, any suggestion? Thanks el__burro   Edited by el__burro - 05 Mar 2024 at 21:03 |
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el__burro
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Brian UK
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Posted: 05 Mar 2024 at 21:40 |
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There are some cheap (oriental) copies on that big auction site, some have used them with no problems.
Don't think you could use that one for anything more than a door stop. Assuming it's a Bosch starter, some places do recondition, but I suspect yours has got beyond that.
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Brian.
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el__burro
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Posted: 05 Mar 2024 at 21:43 |
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I have mounted the old one, solenoid under but cannot remember the wiring positioning. Thanks. el__burro
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el__burro
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Dave P.
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Posted: 05 Mar 2024 at 23:00 |
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[URL= ][/URL]https://www.gutsibits.co.uk/pr/TheShop/index.php?q=valeo+starter+motor&f=d&Model=16&search=SEARCH
I have one of these on my 1971 V7 Special. I think it's the £125.00 one. |
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TO LIVE OUTSIDE THE LAW YOU MUST BE HONEST.
1971 V7 Special. 1972 850GT. 1970 T120 Bonnie. 2009 500 Bullet. |
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Dave P.
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Posted: 05 Mar 2024 at 23:18 |
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I'm obviously failing to understand something here. Not entirely surprising !!
On the 850T wiring diagram there is a black wire going from the battery + terminal directly to the starter motor and from the rectifier a red wire to the starter motor solenoid. What does the black wire do? I'm confused. |
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TO LIVE OUTSIDE THE LAW YOU MUST BE HONEST.
1971 V7 Special. 1972 850GT. 1970 T120 Bonnie. 2009 500 Bullet. |
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el__burro
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Posted: 05 Mar 2024 at 23:24 |
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My understanding is that the + wire is live from battery terminal and the other from the rectifier to solenoid comes from the start button. That's my set up, just with the colours the way around, as it makes more sense to me.
Thanks el__burro
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el__burro
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Brian UK
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Posted: 06 Mar 2024 at 08:19 |
You're looking at the V850 drawing ('73). 1973_V850_USA.gif (3029×2410) (thisoldtractor.com) The black wire is the main heavy wire to the starter. It has no start relay. The 850T ('74) is totally different, there is a start relay which is fed from fuse 2 and via the ignition switch. So when they decided to add that relay they also cocked it up by feeding it via the ignition switch. A lesson they have yet to learn.
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Brian.
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Chris950s
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Posted: 06 Mar 2024 at 08:26 |
The black wire from the battery + terminal to the starter motor solenoid is a heavy duty one that provides the charge to run the starter motor. The red wire to the starter motor solenoid is from the starter motor relay and not from the rectifier, this wire provides charge to the starter motor solenoid switch that allows the charge from the battery to the starter motor. There are three red wires from the rectifier, one goes to the battery + terminal, one goes to the regulator and the third to the ignition switch. If you would like a coloured wiring diagram for yout 850T please have a look at my thread http://guzziriders.org/a3-colour-laminated-wiring-diagrams_topic9400.html
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Chris and Karen - Essex
2011 Stelvio NTX, 1974 950S (750S replica nearly rebuilt!), 1966 Triumph T100SS 59 years young this year! |
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Chris950s
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Posted: 06 Mar 2024 at 08:36 |
On the V7 the wiring is different to the 850T as Brian has said. The live feed to the starter motor is from a heavy black wire from the battery to the starter motor solenoid but the switching power that activates the solenoid comes from the starter button via a brown wire. I have also produced a coloured wiring diagram for these models see my thread http://guzziriders.org/a3-colour-laminated-wiring-diagrams_topic9400.html Best wishes Chris
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Chris and Karen - Essex
2011 Stelvio NTX, 1974 950S (750S replica nearly rebuilt!), 1966 Triumph T100SS 59 years young this year! |
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Brian UK wrote: