JP8 question

[jasaircraft]

Hi, to be clear on this, if JP8 has the jumper in place the ecu will expect a ground for a signal right? if not installed it will expect a 12v signal?

[jsmcortina]

No.

If JP8 is in place the input won't work.

James

[jasaircraft]

No.

If JP8 is in place the input won't work.

James

thanks James!

[Camo]

No.

If JP8 is in place the input won't work.

James

Hi James,

Firstly I have no idea about these MS and haven't even connected one wire after reading 25 hours worth of information about wiring up the MS into a vehicle, but would like to clarify what you have said.

The MS3 manual says, JP8 is jumper for a pullup on the "Nitrous in" input. Normally the nitrous system expects a 12V input here and the jumper should be omitted. If re-using this input for a ground-swiching input then install the jumper.

Just in relation to the last part of that sentence If re-using this input for a ground-swiching input then install the jumper, I think you are saying with a jumper in place that this input wont work yet the manual says it will work if you fit the jumper. I'm very confused sorry. My MS3x has a jumper in place, but I will never use Nitrous and would like to have this port available for a possible switch if need be. So do I leave the jumper in place?

I hope this hasn't come across rude at all, I'm just going crazy trying to get me head around all of this. I still don't know if some of the circuits/pins on DB37 are inputs or outputs.

Thanks, Kevin (Dumb arse when it comes to this stuff)

[jsmcortina]

Leave the jumper off.

You can only use the jumper as a ground-switch input if you re-write the firmware.

James

[Camo]

Thanks James,

so I guess that means leaving the jumper would affect all the additional switch inputs, not just the nitrous input (25).

Cheers, Kev

[jsmcortina]

so I guess that means leaving the jumper would affect all the additional switch inputs, not just the nitrous input (25).

No, as the manual says, it only impacts the nitrous input. However, just remove it and throw it away or something.

James

[jasaircraft]

Just to be clear jp8 is a 12v input and jumper should be tossed to the inner fires of Mordor.
right?

[dontz125]

The next question then becomes, Why is JP8 populated with the header pins?

[jasaircraft]

Thank god i didnt connect nitrous input to anything yet...