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Blocking Diode Location 99 50 hp Johnson

J

jsurf2008

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"Situation is I had carbs reb

"Situation is I had carbs rebuilt, guy doing the work unplugged VRO harness(not using VRO) and the pins where corroded and must have shorted the alarms, before carb work had no problems with alarm lights or warning horn, now I have a constant "hot" light on and no horn? I have unplugged temp switch and grounded to see if horn would work, it did not and the manual says Blocking Diode is bad; the horn does work during self test when key is switched on. Yes the engine does run in test tank, tell tale is pushing water out fine, temp on water housing is touchable, and motor does go above 2500 rpm so S.L.O.W. is not engaged. I have the new blocking Diode from OMC (12.00) but instructions are for different model then mine and give a different location/setup.
Question is does anybody have a picture of where on the 99J50PLEEA wiring harness the Blocking Diode is located? All help is greatly appreciated. I did look on BRP parts catalog but schematic is very vague.
Thanks,

jay"
 
"i highly doubt,that blocking

"i highly doubt,that blocking diode,is ur problem...it is in the wiring harness,..i would have to look up the exact location..here is the pin info,that may help u trace ur problem..

Purple wire goes to pin 1 - 12V Key Switch On
Black wire goes to pin 2 - Ground
Gray wire goes to pin 3 - Tach pulse

.
Grounding these pins listed below activate the following on the actual System Check systems:

Pin 4, (tan w/yellow stripe) turns on No Oil light (wire from VRO Pump)
Pin 5, (tan w/black stripe) turns on Low Oil light (wire from VRO Oil Tank)
Pin 6, (tan w/no stripe) turns on Hot light (wire from Overheat Sensor in head)
Pin 7, (tan w/orange stripe) turns on Check Engine light (wire from In-Line Fuel Sensor)
Pin 8, (tan w/blue stripe) used to activate the Warning Horn. It supplies a ground to the horn circuit when any other warning circuit (pins 4 thru 7) are grounded"
 
"Thanks, jwb

I went out and

"Thanks, jwb

I went out and unpluged the connector from back of tach and checked for voltage on all pins with key on and off the only one that had 12 volts was white with blue stripe and purple with key on. also noticed that previous owner had wired a seperate gray and purple to the post for the lights so I unhooked them. so it looks like tach is bad since when I plug in tach I get HOT and LOW OIL lights and no horn, I do get a short horn when key is first turned on. any thougths or suggestions?"
 
"that eng,...should not set a

"that eng,...should not set a horn,unless running,..when showing overheat,w/sys ck gauge..disc the activated sensor wires,..low oil--disc the wires for oil tank,..overheat,disc cyl hd ,tan wire,..and try....if it still shows those activated---bad tach/guage cluster.the electronics to dr alll warning systems,r in the tach."
 
"Thanks, jwb

oil tank and w

"Thanks, jwb

oil tank and wiring has been disconnected since i got the boat, should have mentioned before, did unhook temp sensor and light is still on, I will get new tach and let you know results.

Thanks again,

Jay"
 
"All is well in the world, sea

"All is well in the world, searched ebay and found new Tach, three miles from the house for $100.00 installed and I have no warning light except for system self check when first turn key on, then all lights go out
happy.gif

thanks for you help jwbmarine.

Jay"
 
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