red plug at firewall

[croft75]

Need some info on the red plug at the firewall beside the brake booster
1 wire goes to the oil pressure gauge/ 1 to the temp sensor the 3rd is broken off on mine and there is no 3rd wire in the plug for the 2 sensors? any idea what the 3rd wire is for?

 

[broncodriver99]

What year is your Bronco?

 

[broncodriver99]

On my '73 there is:

Red w/white trace = Temp Sender
White w/red trace = Oil Pressure Sender
Red w/green trace = Ignition Coil +

 

[croft75]

ok makes sense now , has a RJM under hood harness.

Maybe you can answer my next question what are the other 2 plugs for? did they become obsolete with the RJM harness, they don't look like they have ever been plugged in?

 

[broncodriver99]

Maybe you can answer my next question what are the other 2 plugs for? did they become obsolete with the RJM harness, they don't look like they have ever been plugged in?

What do they look like? I have a spare plug on my '73. It is a 4 pin square connector that isn't connected to anything and doesn't appear to have been.

 

[Crush]

That 4 pin is the nss and backup light plug. On a standard shift there will be a loop instead of a nss connection. Warning. Bronco will not start without the nss loop. I racked my brain for 5 daysbefore i finally figured it out that i hadnt plugged it back in