ICP/DIC circuit anomaly

[Wes Leland]

Testing for parasitic draw with test light connected to positive side. Test light is on and truck was off all night. Battery is 12.78V. The circuit shows 1.5-1.7v drop across the fuse. Charted out it was a 200-230ma draw down on the battery.

 

When I pull the 10A fuse for ICP/DIC, test light begins pulsing, it doesn’t go off it pulses from bright to dull with regular frequency.

 

How can current be passing through a circuit when the fuse is not present?!?!

[Earl Cordova]

Your test light will be drawing current.

And if you have a voltage drop across your fuse, the fuse is blown.

You don't measure current with a chart, you need an ammeter for that.

[Wes Leland]

Hi Earl, testing a cross the fuse shows a 1.7 mv drop from one side to the other. This tells me there is still current running through the circuit, even though the truck is off. Enough to drain the battery over several days sitting.
 

that reading should be 0.0mv when the truck is sitting off.

 

I tried a new fuse. It did not change the parasitic draw. A 1.7mv drop on a fused, 10A circuit is the equivalent of about 220-230mA, according to Ohms law, probably.

 

Thanks!

any other ideas?

[Wes Leland]

Here is where the charts are:

Hi Earl, testing a cross the fuse shows a 1.7 mv drop from one side to the other. This tells me there is still current running through the circuit, even though the truck is off. Enough to drain the battery over several days sitting.
 

that reading should be 0.0mv when the truck is sitting off.

 

I tried a new fuse. It did not change the parasitic draw. A 1.7mv drop on a fused, 10A circuit is the equivalent of about 220-230mA, according to Ohms law, probably.

 

Thanks!

any other ideas?

[Wes Leland]

https://www.powerprobetek.com/wp-content/uploads/2018/12/fuse-charts.pdf

[dna9656]

Well I don't know near as much as you guys do but there are parasitic draws on the vehicle, the clock, and computer memory the radio station preset and who knows what else!? How does a test light come on when it's connected to the + battery and touching the upper radiator hose (which is rubber....) cars used to do this, I think it's the metal content in the hose, the coolant and the metal radiator. Radiators are all plastic now so maybe this doesn't happen on newer vehicles???

" You got to be wery, wery qwiet when you hunting wasklely electrons said the wise old sage ELMER FUDD!

Never dismiss a bad ground when hunting electric anomalies...

 

Dna