Wired up Koso temp gauge has issues when engine running
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Enthusiast
2005 Stella 2T, 2014 Stella 125 Automatica
Joined: 20 Jul 2018
Posts: 96
Location: Staten Island, NY
Thu Jan 10, 2019 7:17 pm quote
Ive wired up a Koso temperature gauge and it works fine when the ignition is on, no engine running, but once the engine starts it has problems: gauge cycles through the "power on" loop endlessly. I've checked all connections, nothing is loose. The gauge needs between 6v and 12v to work, and while engine running power never dips below 12v. I've had it wired to the orange wire from ignition, the purple wire from ignition and the gray battery positive wire to horn (cross checked with the wiring diagram. All present the same issue.

battery on, no engine:
battery on, engine on:
Just wondering if there is some wiring issue that I need to solve, or if this could just be a defective gauge?

here is the wiring for power to the gauge (connected to the orange ignition wire and black ground wire)

IMG_20190108_194403_575.jpg

Ossessionato
LXV 150 Midnight Blue (SOLD)
Joined: 06 Dec 2010
Posts: 2427
Location: Bangkok
Thu Jan 10, 2019 7:57 pm quote
Basic stuff?

- What happens if the spark plug sensor is disconnected?
- What happens if you hold the gauge in your hand?
Ie. not physically mounted on the bike
Ossessionato
1976 Super (x 2), 1974 Primavera (x 2), 2006 Fly 150
Joined: 26 Sep 2013
Posts: 4388
Location: So Cal
Thu Jan 10, 2019 11:26 pm quote
Try using a resistor spark plug or resistor cap.
Enthusiast
2005 Stella 2T, 2014 Stella 125 Automatica
Joined: 20 Jul 2018
Posts: 96
Location: Staten Island, NY
Fri Jan 11, 2019 3:32 pm quote
Resistor spark plug solved the issue. Thanks! knew it had to be something with irregular power signal, but had no idea how to solve it.
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