Oil Temp Gauge Wiring By Bashan (Read 2,258 times)

[Bashan]

Hey guys, I thought I'd run this by y'all and see what you think. I'm trying to get this oil temp gauge hooked up and the wiring instructions seem kind of bizarre. If you'll look on this diagram I made from the instructions the orange wire hooks unswitched to the positve pole of the battery. Then the red wire hooks to a positive switched source.

Why would it need these two positive sources? The only thing I can imagine is one of them powers the sending unit and one powers the gauge. The instructions say hook the green on the gauge to the red on the sending unit. Green to red is against my experiences blowing more than a few fuses, but if they say so. I think the white to dashboard lights is for the LED which I don't need so I'll probably tape that off. Man, this thing wants more positive sources than a resume'! Any thoughts on this will be appreciated. Rich

[noday]

my first guess is that red is a low amp draw that turns orange off and on. (since orange is always connected to ) 12V)

designed to not overload the key switch , in terms of amp draw, & to turn device off when engine is off so that battery is not drained.

this implies that the device itself may use a significant amount of current ?

[Bashan]

I wondered about that too, does the red turn the orange on. That may be the case but as far as current draw the instructions say fuse for one amp, not a lot. I did touch the white wire to a positive source and the LED lit up so I know that part works. It'll change colors too with the push of a button! Rich

[noday]

that 1 amp fuse is inline with red to the switch. looks like protecting the switch from arch damage.

I think the main goal of the circuitry is to protect the battery from draw down when the engine is not running. (sitting for days or weeks)

you don't need to monitor the oil temp if the engine is not producing heat (running)

this was designed for a car dash so you have to keep that in the back of your mind when thinking about how it was intended to work.

you can always hook the gauge up to just a battery and the sender with the sender in hot water. leaving white free

looks neat

[Bashan]

I try to keep in mind what the gauge was designed for, not much is for a scooter. By the way Noday, you were right on that universal R/R, I need to update that post. Anyway, I'm just cobbling this oil cooler project together to try and get it functional before the riding season fizzles out. I figure I'll strip the scooter down over the winter and redo everything. For right now here's my dashboard with the temp gauge mounted:

Can anybody tell what the dash is?.......HAR! The gauge is wired in according to the instructions and you can see it's working with the scooter all warmed up. The pump has to be running while I'm testing the gauge for two reasons, the gauge is wired to the pump's power supply, and the hot oil must be running through this sensor on the side:

Here's a macro view of the torture rack, the weather sucked today, drizzling rain and cold. I had to get these pictures with the scooter half in and half out of the garage, not the best lighting:

I was satisfied everything was wired in right and shut off the power to the pump. This turned the gauge off even though the orange wire was still hooked up, as it should have:

I'm going to try and work on getting the other sensor hooked up along with the volt and ammeter, and hopefully take it out on the road this weekend. Rich

[sprocket]

Looking real good!

[noday]

looks like good progress.

just wondering if you have an estimate on how much the radiator will drop the oil temp ?

glad the electric part is working out too.