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Author Topic: Diode Board  (Read 154 times)

Offline Bob_Roller

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Diode Board
« on: May 06, 2021, 01:19:34 PM »
I was working on the Guzzi last weekend, had the seat and side panels off .
I had a lot of electrical issues when I first got the bike 12 years ago, easy fix once I found that the majority of ground wires were not in contact with the frame .
The previous owner had neglected to put the grounds on the negative battery cable where it bolted to the frame .
The diode board is located under the left side panel in a good airflow area .
I saw the large diameter wire lead that I made and thought I'd pass this on .
There are two output terminals on the diode board, I added this extra wire from the board to the battery, improved charging system performance .
If you have the area around the diode board opened up, it's an easy addition to make .
If you have not been in this area before, the output wire from the diode board goes to the positive terminal of the starter .
'81 R65
'82 R65 LS ?
'84 R65 LS
'87 Moto Guzzi V65 Lario
'02 R1150R
Riding all year long since 1993 .
I'll give up my R65, when they pry my cold dead hands from the handlebars !!!!!

Offline mrclubike

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  • Jungheinrich Master Tech
Re: Diode Board
« Reply #1 on: May 08, 2021, 08:59:13 PM »
For you tinkering types
You can make a diode board out of a Delco 10SI alternator work and is heavier duty and cheaper  ;)
1982 R65 running tubeless Snowflakes
2004 R1150R

Offline Bob_Roller

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Re: Diode Board
« Reply #2 on: May 09, 2021, 11:48:19 AM »
I still have the OEM diode boards on the R65's and Guzzi .
I'm surprised the board on the '81 R65 is still functioning, with the lighting load it's had for the last 20 years .
Everything is now LED and the charging system voltage is higher than it's ever been, rarely drops below 13 volts at idle .
I bought 2 aftermarket heavy duty diode boards a few years ago off of local Craigslist, 2 for $60 .
'81 R65
'82 R65 LS ?
'84 R65 LS
'87 Moto Guzzi V65 Lario
'02 R1150R
Riding all year long since 1993 .
I'll give up my R65, when they pry my cold dead hands from the handlebars !!!!!

Offline mrclubike

  • Posts: 1437
  • Jungheinrich Master Tech
Re: Diode Board
« Reply #3 on: May 09, 2021, 12:02:31 PM »
LED Bulbs are the best upgrade you can do.
Really makes all the after market heavy duty charging system parts obsolete ;D
1982 R65 running tubeless Snowflakes
2004 R1150R

Offline georgesgiralt

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  • I Love YaBB 2!
Re: Diode Board
« Reply #4 on: May 09, 2021, 12:20:54 PM »
Hello !
I also have the original diode board into the front cover... At more than 200 000 km of permanently lit front headlight, it is not that bad. I had a regulator failure (output transistor) taken care of under warranty and a hall sensor failure (in the shop ! )
So all in all, the electrical parts are wonderful !

Offline Bob_Roller

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Re: Diode Board
« Reply #5 on: May 12, 2021, 08:24:13 AM »
I was seriously considering an upgraded charging system, glad I didn't go through with it .
'81 R65
'82 R65 LS ?
'84 R65 LS
'87 Moto Guzzi V65 Lario
'02 R1150R
Riding all year long since 1993 .
I'll give up my R65, when they pry my cold dead hands from the handlebars !!!!!

Offline donbmw

  • Posts: 407
Re: Diode Board
« Reply #6 on: May 13, 2021, 09:35:06 AM »
Since I have the upgraded charging system  on all my bikes it has been longer than any stock diode board was installed.
1975 R90/6, 1980 R65, 1982 R65, 2015 Ural Patrol & 1959 Triumph TR3