instrument malfunction

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wcmiller2002
Posts: 22
Joined: Sat May 10, 2014 4:46 pm
model: 750 Paso
year: 1987
Location: USA

instrument malfunction

Post by wcmiller2002 »

Was just riding along today (JRA) after 60 miles when oil temp buried its needle to maximum along with the fuel needle (to full). Possibly also turn signal lights on dashboard also went bright (hard to tell in full sun).

Intermittently the oil temp gauge would return to more likely value (lower) but would quiver.

Engine had no issues and appeared to run fine.

Does anyone have any ideas before I spend quite a bit of time reviewing the electrical schematic?

Thanks!
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ducapaso
paso grand pooh-bah
Posts: 1097
Joined: Sun Aug 01, 2004 12:00 am
model: 750 Paso
year: 1988
Location: siena, italy
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Re: instrument malfunction

Post by ducapaso »

Maybe uncorrect grounding because of rust or heating, Have a look to the connections under dashboard and to the ground wire.
As extreme measure you can open the rear cover of the dashboard, put a new wire under one of the negative threaded pin of any instrument (rev counter, clock, oil temp, fuel level) and ground it.
have a nice ride, Nicola

Black "DUKE" 751582
ex...Red "smooth" 753349 :-(
wcmiller2002
Posts: 22
Joined: Sat May 10, 2014 4:46 pm
model: 750 Paso
year: 1987
Location: USA

Re: instrument malfunction

Post by wcmiller2002 »

Nicola,

Thank you very much for responding. It appears to have been a faulty ground on the oil temp sensor.

When taking off the fairings, this wire essentially carries the load for the oil coolers and hoses. Probably a good idea to disconnect oil cooler wiring before removing fairings.

Turn signal lights appear to stay on as warning for a turn signal bulb not working. Replaced bulb and that problem went away.

Test in driveway good. Will do full test tomorrow.

Chris
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ducapaso
paso grand pooh-bah
Posts: 1097
Joined: Sun Aug 01, 2004 12:00 am
model: 750 Paso
year: 1988
Location: siena, italy
Contact:

Re: instrument malfunction

Post by ducapaso »

:thumbup:
have a nice ride, Nicola

Black "DUKE" 751582
ex...Red "smooth" 753349 :-(
wcmiller2002
Posts: 22
Joined: Sat May 10, 2014 4:46 pm
model: 750 Paso
year: 1987
Location: USA

Re: instrument malfunction

Post by wcmiller2002 »

As a follow up rode test ride. It was about 170 miles mostly in the mountains including highway 28, 64, and 178 in Highlands, Cashiers, and Rosman NC. Not a bad day.
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