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 Post subject: Replacement relay hunt
PostPosted: Sun Nov 03, 2019 9:31 pm 
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Joined: Mon Oct 07, 2019 7:24 am
Posts: 35
Location: USA
model: 907 I.E.
year: 1991
The two major ignition and fuel injection relays on my bike are flaky. I see recommendation here for a replacement relay as part R1377, but I can't see how that would work. It's a changeover relay (we need double output) and it's type B pin configuration (we need type A). A bosch double output relay is readily available, but it's type B. I can't seem to locate a type A anywhere. A type B would require rewiring the plug.

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91 907ie
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 Post subject: Re: Replacement relay hunt
PostPosted: Mon Nov 04, 2019 9:47 pm 
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Joined: Mon Oct 07, 2019 7:24 am
Posts: 35
Location: USA
model: 907 I.E.
year: 1991
For example, here is a type B double output relay. These are often called double make and break. If you look at the bottom pin configuration, you would need to swap the wires to pins 30 and 86

Bosch Automotive 0332019151 Relay is type B


Attachments:
Relay Type B.png
Relay Type B.png [ 328.38 KiB | Viewed 194 times ]
File comment: Ducati Relay. Type A. Note position of pins 30 and 86
Ducati_relay.png
Ducati_relay.png [ 186.29 KiB | Viewed 194 times ]

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Bill
91 907ie
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 Post subject: Re: Replacement relay hunt
PostPosted: Tue Nov 05, 2019 7:17 pm 
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paso grand pooh-bah
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Joined: Thu Nov 03, 2011 10:13 am
Posts: 679
Location: Scotland
model: 907 I.E.
year: 1994
I haven't pulled them out to have a look but the diagram shows 4 pin on/off relays, not changeover. There is no pin 87a on the diagram. If the ones fitted to the bike have it it is redundant.
When I need to replace the relays, if I need to I'll quite happily swap round the socket terminals. It is very easy to do and if you damage one new terminals are readily available.

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2017 Supersport 939
2015 Scrambler Classic
1982 Pantah 500SL


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 Post subject: Re: Replacement relay hunt
PostPosted: Tue Nov 05, 2019 9:15 pm 
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Joined: Mon Oct 07, 2019 7:24 am
Posts: 35
Location: USA
model: 907 I.E.
year: 1991
Right, there is no 87A. The relays have two 87 outputs, Normally Open. All 5 pins are wired. Sure, I could swap wire 30 for 86 on the plug and get a Type B 5 pin dual output and be done with it. That looks like the easiest option at the moment with no 5 pn Type A relays available, as far as I can see. Oh, well. I appreciate the input.

Update: I opened up the relays again and cleaned the contacts a bit more (using a business card). Everything works reliably now. Bike starts and runs fine. Woohooh!

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91 907ie
Buckeye, AZ.


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 Post subject: Re: Replacement relay hunt
PostPosted: Wed Nov 06, 2019 10:07 am 
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paso grand pooh-bah
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Joined: Thu Nov 03, 2011 10:13 am
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Location: Scotland
model: 907 I.E.
year: 1994
Good to hear that you've got the bike running again :thumbup:

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2017 Supersport 939
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1982 Pantah 500SL


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 Post subject: Re: Replacement relay hunt
PostPosted: Wed Nov 06, 2019 11:34 am 
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Joined: Mon Oct 07, 2019 7:24 am
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Location: USA
model: 907 I.E.
year: 1991
Yes, after replacing a starter that didn't need replacing because I refused to believe the 6 month old battery was failing, I am finally at peace again. The relays coincidentally started flaking out. I was getting ready to pull the ignition switch and check that --- all for the want of a battery. All better now except for my headache. :banghead:

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 Post subject: Re: Replacement relay hunt
PostPosted: Wed Nov 06, 2019 7:05 pm 
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paso grand pooh-bah
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Joined: Thu Nov 03, 2011 10:13 am
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Location: Scotland
model: 907 I.E.
year: 1994
When you have the time and feel like it it's a good idea to do the wiring mod and fit a relay to take the load off the ignition switch. I wondered why all the lights including the headlight on mine went dim..bright..dim..bright in time with the flashers. On investigation I found that it was dropping more than 0.5V across the ignition switch. The relay mod cured this and improved the lights.

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2017 Supersport 939
2015 Scrambler Classic
1982 Pantah 500SL


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 Post subject: Re: Replacement relay hunt
PostPosted: Thu Nov 07, 2019 5:43 am 
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Joined: Mon Oct 07, 2019 7:24 am
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Location: USA
model: 907 I.E.
year: 1991
Will do. Thanks.

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