Relay trouble - MVAgusta.net
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post #1 of 17 (permalink) Old 05-05-2019, 12:23 PM Thread Starter
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Relay trouble

My 2000 F4 750 has been in the workshop for a long while. When I came to fire it up after a long winter, there was little to no sign of life. Battery was full-charged, but nothing on the dash. (There was a momentary blink of warning lights as I turned the key, but nothing more)
All was well when I rattled the 3 relays on the Left-hand side. Dash came to life, Rev counter swept, bike started fine.
Before I get stupid and replace *every* relay, does anyone have a suggestion as to which relay itís likely to be?
PS, when I first bought it, the charge warning light would flicker once the revs rose. Now it doesnít. Might this help diagnosis?
Thanks in advance.

F4 750S 2000
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post #2 of 17 (permalink) Old 05-05-2019, 12:37 PM
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Check the 40amp fuse seating dude.


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post #3 of 17 (permalink) Old 05-05-2019, 01:22 PM
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The relays to the left of the headlight are the Hi and Lo beam relays.

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My guess here would be that you rattled the dash enough to shake the multi-pin connector on the back of the dash. Were it me, I'd remove the dash, disconnect the multi-pin connection, clean it and then reassemble.

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post #4 of 17 (permalink) Old 05-05-2019, 01:54 PM Thread Starter
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The relays I ďdisturbedĒ are the three to the left of the bike, below the tank, beside the alternator. One is the starter relay with a 40a fuse, which dipple666 suggested I check. Iíve reseated this the centre one, I gather, is the flasher relay (more later) and the last, most forward one is - I dunno.
Should I bother replacing any or all of these? The starter one is cheap enough, but is it vulnerable to failure? Could the front-most one cause the lack of electrical power to the dash etc.?

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post #5 of 17 (permalink) Old 05-05-2019, 02:02 PM Thread Starter
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Iíve found a can of worms here! Lots of electrical tape around the cables leading to the relays above. On picking this off, I found:
A bodge on the indicator relay, where the previous owner has added a resister or something. That relay will be replaced, as it appears to have been filled/sealed with some white, powdery substance. Once I have both front and rear indicators fitted I can check whether the additional component is needed.

On the front-most relay, someone appears to have attempted to bridge the blue and the white wires with a small electrical component. Tiny, black, possibly a diode? The rigid wires of this are broken, so itís not serving any purpose.

Is this some superduper enhancement iím not aware of? If not, iíll clip it off! The 5-way connector for that relay is in less-than-first class condition. Any readily-available replacements?

F4 750S 2000
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post #6 of 17 (permalink) Old 05-05-2019, 03:12 PM Thread Starter
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Relay connection mod

An attempt to connect blue and white.
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F4 750S 2000
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post #7 of 17 (permalink) Old 05-05-2019, 03:58 PM
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Yep....that's a diode.

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post #8 of 17 (permalink) Old 05-05-2019, 04:17 PM Thread Starter
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Originally Posted by esq'z me View Post
Yep....that's a diode.
Does it serve any useful purpose?

F4 750S 2000
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post #9 of 17 (permalink) Old 05-05-2019, 04:26 PM
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I know my Senna has a single diode that has been there from the factory.

I do remember replacing it years ago, Donsy solved the fault from the other side of the world, but I can't remember the root cause.

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post #10 of 17 (permalink) Old 05-05-2019, 04:39 PM Thread Starter
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Unless I hear otherwise, I propose to leave the situation as is
Viz. diode disconnected, as the bike works without it.
Waiting for you all.

F4 750S 2000
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