Lambretta D & Lambretta LD Marelli & Filso Wiring Diagrams

(Updated Sep2021 – Also found under Restore & Rebuilds page)

MK II and MK III Lambretta D & LD Wiring Diagram and Routes

Notes:  There is some information on MK1’s below as well (Coil with secondary coil) and further information to follow on colours.  What’s important is not the colours of wiring used, but an understanding of what you or someone else is installing and the routes required. Click on an image below to increase the size if required. Notes:  Most people refer to the Green cable whenever you have any ignition problems (Check the GREEN cable ect).  You may also find some You Tube videos referencing the Green cable.  I won’t go into my own speculation why. If you have a Filso Magneto, they do use different colours (Filso – Green Ignition is Red & the Red Lighting (On a Marelli) is Green (On a Filso).  Some people may simply use the Marelli wiring scheme for a Filso Magneto when they work on wiring, to make it easier for themselves and for when they ask questions in the community (you often get the response “check the Green wire”), as most people will believe you have it set up so that Green is the Ignition cable. Electrical System diagram also shown below.  One with colour code to trace and see where loom wires are located and the other diagram is not as good as the first from a cable colour point of view, but it does show the second (lighting) cable / Rectifier route; if it is applicable to your model of Lambretta. For engine rebuilds – I would not look at any of the loom / electrics or lighting myself and until I got the Lambretta running from the Ignition (Green cable on a Marelli) to the Coil (I may bypass the HT Block as well).  Once cabled, I would check the spark plug by holding it in my hand for a short shock, rather than looking for a blue spark. Pay special attention to NOT ground or earth your Points by ensuring the Fibre Washers are used and the hole the nut and bolt goes through to hold the Condensor Cable and Points (Green cable to outside or HT Block position M on the Marelli example below) cable also has a Fibre Washer in place and not damaged, otherwise grounding / earthing will occur.  If the hole fibre wash is damaged, but Points are still OK, by a plastic washer kit and replace this section.  The Condensor cable and Green cable should not be earthed (Hence Fibre Washer solution used).  If points arm is on the Right – then fibre washer and Green Cable and Condensor Cable is on the Left, the connection is made via the Nut and Bolt that holds it together.  See example below. Note:  In the Cassell Book of the Lambretta page 93 refers to the Rectifier cable colour being RED.  This would therefore imply the example they use is based on a Marelli Magneto, which in turn would imply for a Filso that the GREEN is used for the Rectifier and BLUE on both is used for the Wiring Loom link up.  Realistically your Lambretta may have different colour cables used as it depends who had and tinkered with it before you![/vc_column_text][/vc_column][/vc_row][vc_row tlg_padding=”pb0″ tlg_equal_height=”equal-height”][vc_column width=”1/2″ css=”.vc_custom_1621365329846{padding: 10px !important;background-color: #dddddd !important;border-radius: 25px !important;}”][vc_single_image source=”external_link” alignment=”center” onclick=”link_image” custom_src=”/files/magneto/Marelli Info_1.jpg” caption=”Marelli Magneto – Note on Rectifer Wiring – The Cassell Book of the Lambretta (Page93), refers to the RED cable being used for the Rectifier and not the blue as shown above.” css=”.vc_custom_1621712788286{border-radius: 25px !important;}”][/vc_column][vc_column width=”1/2″ css=”.vc_custom_1621365376802{padding: 10px !important;background-color: #cccccc !important;border-radius: 25px !important;}”][vc_single_image source=”external_link” alignment=”center” onclick=”link_image” custom_src=”/files/magneto/Filso_Info_1.jpg” caption=”Filso Magneto – Note on Rectifier – Decide which one to use for the Rectifier wiring. For a Marelli Magneto, the Cassell book of the Lambretta page 93 shows a RED cable being used.”][/vc_column][/vc_row][vc_row tlg_padding=”pt0″ tlg_equal_height=”equal-height” css=”.vc_custom_1621365594551{padding: 0px !important;}”][vc_column width=”1/2″ css=”.vc_custom_1621365540559{padding: 10px !important;background-color: #cccccc !important;border-radius: 25px !important;}”][vc_single_image source=”external_link” alignment=”center” onclick=”link_image” custom_src=”/files/electrics/150D_150LD_Electrical_System_Operational_Diagram.jpg” caption=”Note – Brown cable seen on Matneto. This is the Brown Wiring Loom cable (Not inside the Magneto!) attached to the HT Block No. 2 Lighting Coil”][/vc_column][vc_column width=”1/2″ css=”.vc_custom_1621365607620{padding: 10px !important;background-color: #dddddd !important;border-radius: 25px !important;}”][vc_single_image source=”external_link” alignment=”center” onclick=”link_image” custom_src=”/files/electrics/Lambretta LD150D_150LD_Electrical_Route.jpg” caption=”Diagram showing Rectifier”][/vc_column][/vc_row][vc_row tlg_padding=”pt0″ tlg_equal_height=”equal-height” css=”.vc_custom_1621365594551{padding: 0px !important;}”][vc_column width=”1/3″ css=”.vc_custom_1621368254283{padding-top: 10px !important;padding-right: 10px !important;padding-bottom: 10px !important;padding-left: 10px !important;background-color: #dddddd !important;border-radius: 25px !important;}”][vc_single_image source=”external_link” alignment=”center” onclick=”link_image” custom_src=”/files/electrics/LD_Points_1.jpg” caption=”Points Install Example”][/vc_column][vc_column width=”1/3″ css=”.vc_custom_1621368271826{padding-top: 10px !important;padding-right: 10px !important;padding-bottom: 10px !important;padding-left: 10px !important;background-color: #cccccc !important;border-radius: 25px !important;}”][vc_single_image source=”external_link” alignment=”center” onclick=”link_image” custom_src=”/files/electrics/LD_Filso_Magneto.jpg” caption=”Filso Magneto”][/vc_column][vc_column width=”1/3″ css=”.vc_custom_1621369082373{padding: 10px !important;background-color: #dddddd !important;border-radius: 25px !important;}”][vc_single_image source=”external_link” alignment=”center” onclick=”link_image” custom_src=”/files/electrics/LD_Marelli_Magneto.jpg” caption=”Marelli Magneto”][/vc_column][/vc_row][vc_row][vc_column][vc_column_text]MK1 Below with bakerlite H.T. pickup.  Wiring similar to above.  Further details on colours and wiring details to follow on MK1 when I get time. Point to note:  With early models (MK 1 / below image / see left Ignition Coil), comprises of a secondary coil wound on top of the primary, both being contained within the magneto framework.  Later models have a separate ignition coil of a car type.[/vc_column_text][/vc_column][/vc_row][vc_row tlg_padding=”pt0″ tlg_equal_height=”equal-height” css=”.vc_custom_1621365594551{padding: 0px !important;}”][vc_column width=”1/3″ css=”.vc_custom_1621368254283{padding-top: 10px !important;padding-right: 10px !important;padding-bottom: 10px !important;padding-left: 10px !important;background-color: #dddddd !important;border-radius: 25px !important;}”][vc_single_image source=”external_link” alignment=”center” onclick=”link_image” custom_src=”/files/electrics/Stator_Plate_Old_Style.jpg” caption=”MK1 (Early Model) Internal Coil (Page 137 TLSB 1st Ed)”][/vc_column][vc_column width=”1/3″ css=”.vc_custom_1621368271826{padding-top: 10px !important;padding-right: 10px !important;padding-bottom: 10px !important;padding-left: 10px !important;background-color: #cccccc !important;border-radius: 25px !important;}”][vc_single_image source=”external_link” alignment=”center” onclick=”link_image” custom_src=”/files/electrics/Coil_MKIII_Location.jpg” caption=”MKIII Coil Location (If you have the three holes on the frame to locate it on model!)”][/vc_column][vc_column width=”1/3″ css=”.vc_custom_1621369082373{padding: 10px !important;background-color: #dddddd !important;border-radius: 25px !important;}”][vc_single_image source=”external_link” alignment=”center” onclick=”link_image” custom_src=”/files/electrics/Coil_With_Holding_Plate.jpg” caption=”Car Style Coil Sample”][/vc_column][/vc_row][vc_row][vc_column][vc_column_text]Wiring Diagrams from The Lambretta Service Mans Book (1st Edition only)[/vc_column_text][/vc_column][/vc_row][vc_row tlg_padding=”pt0″ tlg_equal_height=”equal-height” css=”.vc_custom_1621365594551{padding: 0px !important;}”][vc_column width=”1/3″ css=”.vc_custom_1621368254283{padding-top: 10px !important;padding-right: 10px !important;padding-bottom: 10px !important;padding-left: 10px !important;background-color: #dddddd !important;border-radius: 25px !important;}”][vc_single_image source=”external_link” alignment=”center” onclick=”link_image” custom_src=”/files/wiring/Wiring_125_LD_MKI_1st_Series_Starter_Page139.jpg” caption=”Lambretta Wiring 125 LDMKI 1st Series Starter Page139″][/vc_column][vc_column width=”1/3″ css=”.vc_custom_1621368271826{padding-top: 10px !important;padding-right: 10px !important;padding-bottom: 10px !important;padding-left: 10px !important;background-color: #cccccc !important;border-radius: 25px !important;}”][vc_single_image source=”external_link” alignment=”center” onclick=”link_image” custom_src=”/files/wiring/Wiring_125_LD_MKI_2nd_Series_Starter_Page140.jpg” caption=”Lambretta Wiring 125 LDMKI 2nd Series Starter Page140″][/vc_column][vc_column width=”1/3″ css=”.vc_custom_1621369082373{padding: 10px !important;background-color: #dddddd !important;border-radius: 25px !important;}”][vc_single_image source=”external_link” alignment=”center” onclick=”link_image” custom_src=”/files/wiring/Wiring_150_LDB_MKI-MKII-MKIII_Self_Starter_Page86.jpg” caption=”Lambretta Wiring 150 LDB MKI MKII MKIII Self Starter Page86.jpg”][/vc_column][/vc_row][vc_row tlg_padding=”pt0″ tlg_equal_height=”equal-height” css=”.vc_custom_1621365594551{padding: 0px !important;}”][vc_column width=”1/3″ css=”.vc_custom_1621368254283{padding-top: 10px !important;padding-right: 10px !important;padding-bottom: 10px !important;padding-left: 10px !important;background-color: #dddddd !important;border-radius: 25px !important;}”][vc_single_image source=”external_link” alignment=”center” onclick=”link_image” custom_src=”/files/wiring/Wiring_150_LDB_MKIII_Page81.jpg” caption=”Lambretta Wiring 150 LDB MKIII Page81.jpg”][/vc_column][vc_column width=”1/3″ css=”.vc_custom_1621368271826{padding-top: 10px !important;padding-right: 10px !important;padding-bottom: 10px !important;padding-left: 10px !important;background-color: #cccccc !important;border-radius: 25px !important;}”][vc_single_image source=”external_link” alignment=”center” onclick=”link_image” custom_src=”/files/wiring/Wiring_Diagram_of_Ignition_Circuit.jpg” caption=”Lambretta Wiring Diagram of Ignition Circuit”][/vc_column][vc_column width=”1/3″ css=”.vc_custom_1621369082373{padding: 10px !important;background-color: #dddddd !important;border-radius: 25px !important;}”][/vc_column][/vc_row]