Automotive 11 to 13.8v step-up

[ataul]

Any how u must determine this, u at least find only continuous current then i understand what kind of steep up circuit u need.

 

[Peugeot]

How does one determine the current draw?

Thx

 

[ataul]

if u have DC clamp on current meter u can easily determined the current drown. if clamp on is high end type you can also determine the inrush current also. another way if u have only malty meter you can set multimeter knob to 10Amp position and place your meter lead + into 10A hole and series the pump motor connection via multimeter and start the motor.be care full your maximum current measuring limit of your multimeter.

 

[3v0]

One solution would be to use the existing pump wire to control a relay. Have the relay switch a fused line directly to the battery. If needed provide a dedicated ground wire to the battery too.

3v0

 

[chemelec]

One solution would be to use the existing pump wire to control a relay. Have the relay switch a fused line directly to the battery. If needed provide a dedicated ground wire to the battery too.

3v0

I Agree, This is by far the BEST Solution!

 

[Nigel Goodwin]

I Agree, This is by far the BEST Solution!

I would say the 'second best' - 'best' would be to repair whatever the fault is - but this is certainly the easiest solution, and should provide a perfect cure.

Certainly a LOT easier and more reliable than trying to make a switchmode voltage converter (which would also increase the current draw, and drop the voltage further).

 

[duffy]

Peugeot - if you are bound and determined to put a step-up regulator in it, the PT6885 voltage step-up module might work for you -
https://www.electro-tech-online.com/custompdfs/2009/02/slts103b.pdf

This device puts out 15V at 4A and works with an input voltage down to 9V. It costs about $40, available from Digikey and others.

I couldn't find a 13V module in this power range, they go straight from 12V to 15V.