Oil pressure switch - Harley Davidson Forums: Harley Davidson Motorcycle Forum
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post #1 of 19 (permalink) Old 11-29-2012, 09:13 PM Thread Starter
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Oil pressure switch

Been chasing a power draw and inspecting wiring, and found the wire leading to the oil pressure switch has a spot where the insulation has worn and bare wire is exposed. uploadfromtaptalk1354245077715.jpg

Is this the possible culprit? Planning to hook a test light between the positive post and cable and start pulling fuses until I find it, but would be nice if it was that simple. Did I mention that I hate electrical gremlins?

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post #2 of 19 (permalink) Old 11-29-2012, 09:32 PM
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I haven't looked at a schematic, but I don't think so. What that switch does, if it is like the one on my bike, is disconnect the negative (ground) side of the oil pressure light from ground when there is pressure, thereby turning the light off. Otherwise, without the engine running, or a loss of oil pressure, it is connected to ground. The ignition/accessory switch interupts B+ to the light.
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post #3 of 19 (permalink) Old 11-29-2012, 09:34 PM Thread Starter
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Figured being a single strand and not sure how it formed a circuit it couldn't be that easy...

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post #4 of 19 (permalink) Old 11-30-2012, 07:08 AM
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To chase down an electrical drain disconnect the negative cable from the battery and connect a multimeter between the cable and the battery terminal. Set the meter to the milliamp range. With the ignition off you should get a reading of less than 10ma depending on model of bike. A security system will give a higher reading briefly then drop down. If your system is reading less than 10ma, that's acceptable.

If the meter shows an excessive drain start removing fuses one at a time untill the excessive drains falls into the acceptable range and trouble shoot that last fused circuit. The same procedure is used on the relay circuits too.

Caution, don't turn the ignition on with the meter in the milliamp range.

Disclaimer : Don't believe anything I say unless you are absolutely sure that I know what I'm talking about .
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post #5 of 19 (permalink) Old 11-30-2012, 07:26 AM
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Did I mention that I hate electrical gremlins?
I feel for ya.. hate the little b@stards. What was the last thing you did to your bike before this started.. when I am running one down I usually look for the last thing done, related or not, sometimes it will lead you to the problem.

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post #6 of 19 (permalink) Old 11-30-2012, 09:41 AM Thread Starter
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Caution, don't turn the ignition on with the meter in the milliamp range.
That would be exciting...

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post #7 of 19 (permalink) Old 11-30-2012, 09:44 AM Thread Starter
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Probably been going on for months but I ride every day. Last weekend it got a bath but I didn't ride- hopped on the bike Monday morning and it had drained enough that I had to throw it on a charger before it would start.

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post #8 of 19 (permalink) Old 11-30-2012, 10:17 AM
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I wonder if its a draw or a weak battery... I've had em die in a year, and not be anything related to the bike.

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post #9 of 19 (permalink) Old 11-30-2012, 03:51 PM Thread Starter
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Could be battery, but it's about 6 months old. Easier for me to check the possibility of a draw first.

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post #10 of 19 (permalink) Old 11-30-2012, 07:14 PM
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Good point, 6 months is pretty new.... thinkin draw now too.

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