Big RED oil light

[motormike131]

    My 71 Ambo.... started it for the first time this year... big oil leak. The PO installed aftermarket amp-oil gauges... the plastic line to the oil gauge broke. So I removed the oil line sending unit and replaced it with a stock electrical unit.. but did not wire it in. Changed the oil.. and started the bike.... red oil line came on and reminds on. Irode it for about 90 seconds.. and parked it...  Syggestions ?...

[Lannis]

    My 71 Ambo.... started it for the first time this year... big oil leak. The PO installed aftermarket amp-oil gauges... the plastic line to the oil gauge broke. So I removed the oil line sending unit and replaced it with a stock electrical unit.. but did not wire it in. Changed the oil.. and started the bike.... red oil line came on and reminds on. Irode it for about 90 seconds.. and parked it...  Syggestions ?...

"So I removed the oil line sending unit".... I got that.

".. and replaced it with a stock electrical unit.."  Got that too.

".. but did not wire it in. "  OK, so far so good.

"Changed the oil.. and started the bike.... red oil line came on and remains on".   Now I'm lost.

Where have you got the "stock electrical unit" connected?   Last we heard, it "wasn't wired in"?

Lannis

[Murray]

The stock switch works through oil pressure overcommong the spring pressure int he switch and breaking the earth connection that allows the light to come on. So basically your light has an earth possibly from the orginal wire floating around and touching something somewhere although depending on what the orginal owner did they may have fitted a murphy gauge or something similar that will also give you a light below a certain pressure, now the gauge has no pressure after its been disconnected the light is refecting this.

[Tom]

In short.......the oil "pressure" sending unit has to be hooked up/connected.

[motormike131]

   I didn't hook up the replacement sending unit because.. there was no wire.. what the PO did with it... who knows ?  my local go to guy said.. ' don't worry bout it ".  Another Guzzi buddy said.. "no problem ". I think in the Am... I'll see about add'n a wire... or... something...  thanks for the input.

[Tom]

Check the wiring harness.  The PO may have cut out the visible portion.  The rest may be in the harness loom.

[motormike131]

        I was go'n to work on it in the morn'n.. but.. it was bugging me.... so... went downstairs.. pull'd the seat..pull'd the tank.. and under the tank.. near the front. the PO bolt'd a oil send'n unit " T'd " with the plastic oil line. So... I removed the attached wire... got a section of wire I had in my tool box.. didn't have any male and female ends.. so I mickey taped it for now.... put the bike back together .. put away the tools.. clean'd my hands... key on.. hit the starter.... oil light came on for a moment and blink'd off.... (insert happy face here)

[Tom H]

Yeah!!

Tom

[Kiwi_Roy]

Loosen off one of the oil lines going to one of the cylinder heads, start the bike, if oil gushes out stop, tighten up the fitting and go riding, thats what I did.
When you get time mount a 100 psi gauge on the RH crash bar and pipe it back to a second banjo on the RH cylinder head, there's nothing like knowing the oil pressure to put your mind at rest.
You will need a longer banjo bolt.

When I first got my Eldorado running I thought finally I have a Guzzi with a working pressure switch, it didn't last long.
Oil pressure starts off at 60 psi cold, as it warms up it can drop to 10 psi at idle but it holds ~ 60 at higher revs