power window wiring

Good day my friend bought 2 single power window motors with 2 fivepin switches as he could not find a 2door kit.   I need to know how to fuse this circuit (fuse size) . Should I wire the power wires of each motor together ,and then to my power supply ignition, or should I wire them with separately with each one on their own fuse. What is the normal amperage on power window motors, I’m using exactly the same motor in image.   Thanks in advance  Do it once,do it right - This means no short cuts. You never get paid twice for having to do the job twice because it wasn't done right the first time.

Don't paste text unless from a plain text editor. I use self resetting circuit breakers which is typical for motors - especially when they can use (say) five times their typical Amperage at their end of travel. If using fuses, I would definitely fuse separately. I think I used separate CBs (5A?) for each with a master CB (15-20A) at the power source. Only 2 windows, and each motor is generally only 2-3A and 9-13A at ends or if jammed.     I used relays rather than specialised switches - not that that impacts fusing.    

The wires from either motor won't be wired to the other motor nor directly to power or ground, they get wired directly to the switch or control module. Industry standard is a single 15-20A circuit breaker for the entire system. The only time you need to down fuse to a low amperage fuse per leg/side is when using wire not capable of 15A sustained current.

Each switch shows 12v 20ampDo it once,do it right - This means no short cuts. You never get paid twice for having to do the job twice because it wasn't done right the first time.

You mean each switch is rated for 20A? It's not often I see 20A window motors - not in cars. But you can use smaller wiring that handles the motors provided the breaker is rated equal or lower. My door switches are rated similarly but only switch a few hundred mA for the relays.

Thank you old spark,Do it once,do it right - This means no short cuts. You never get paid twice for having to do the job twice because it wasn't done right the first time.

Hi Old Spark! I want to know is it safe to get each motors supply from the ignition wire and won't the motors put too much pressure on the ignition wire.and if I wire another switch on the driver side to the passenger motor,which means I will just have to take the motor wires from the switch to the legs of the passenger door motor.what will happen if I press the passenger switch down on the driver side and someone on passenger side at the same time press the switch up,won't it cause a short.can you please explain to me how that part works.thank in advance.Do it once,do it right - This means no short cuts. You never get paid twice for having to do the job twice because it wasn't done right the first time.

If the IGN circuit can handle the window power it should be fine. I don't have that problem since I use relays and I take their power from a fused battery +12V feed. [I never add multi-Amp "loads" to the IGN circuit; instead I use relays with their coils controlled by IGN +12V (or ACC +12V etc) and whatever other switching is required.] The powering of the relay coil determines when the windows operate - eg with ACC or IGN or anytime from +12V. 5-pin wiring should be such that destructive shorts are not allowed. If allowed, the fuse will blow (or in my case, CB trip until it self resets).

Thank you,I understand the ignition switching 100%.about the shorts,are you telling me its designed not to short out if there's 2 switches on one motor.Do it once,do it right - This means no short cuts. You never get paid twice for having to do the job twice because it wasn't done right the first time.

Using two switches per one motor, they are wired in series. On dedicated 5 pin window switches they are isolated on the POS side, the ground sides are linked. In other words,how the switch is wired controls the motor.