F4 Main Relay ordeal: USD$9.31 - MVAgusta.net
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post #1 of 7 (permalink) Old 12-27-2019, 05:43 PM Thread Starter
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F4 Main Relay ordeal: USD$9.31

Just wanted to share the end of my 2 week ordeal tracking down a blackout issue on my 2001 F4.

Overnight, as electrical problems always happen, there was no sign of life with ignition switch in ĎONí position to any components. I had tested all wires, relays, fuses, battery, earths several times, scratching my head. It didnít add up and I worried it was the ECU itself.

Fortunately it was only the main (general) relay. Out of curiosity I took it apart and found the contact/tang (87b) was degraded and pitted (and of course itís the terminal that supplies almost everything electrically). Iím guessing it was Ďworkingí intermittently when I tested it.

Big thanks to Deet at ECU Meistro for encouraging me to check the main relay again! Others less scrupulous could have exploited the situation. Heís earned my trust, future business, and good press!

The MV part number 800094439 cross-referenced with quite a few known brands. But I went with Bosch, part number 0332019151. I got this for USD$9.31, thru AutohausAZ down the street from me in Phoenix. They have wholesale prices, a good bit of savings over Star Twinís $40. Hereís the itemís webpage:

https://www.autohausaz.com/pn/0332019151

I hope this helps others with possible deceptive relay issues, save some money, and promote an honest businessman Deet.
Motorcycle ECU Repair

Cheers
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post #2 of 7 (permalink) Old 12-27-2019, 10:15 PM
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Great, You will see my detailed experience with Deet here:

https://www.mvagusta.net/forum/20-ma...australia.html
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post #3 of 7 (permalink) Old 12-27-2019, 11:12 PM Thread Starter
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@Glenno Yes I had previously read your thread, which swayed me to reach out to ECU Meistro. I was initially going with CarmoUSA in nearby California, but could never get a hold of someone. So it all worked out in the end.
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post #4 of 7 (permalink) Old 12-28-2019, 08:24 AM
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The generic relays that are used in MV and Ducati and many other applications have been discussed here before.

There is a thread somewhere that lists part numbers for replacement.

I want to thank you for taking the time to disassemble and take pictures.

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post #5 of 7 (permalink) Old 01-02-2020, 01:37 AM
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post #6 of 7 (permalink) Old 01-02-2020, 03:16 AM
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Good news, glad your finally sorted.
So it was the main relay as I suggested..we should all carry a spare for that money.
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post #7 of 7 (permalink) Old 01-22-2020, 04:43 PM
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I keep all the relays for my F4 in a spares box.
Why have a breakdown and lose half the summer messing around.
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