Today on this 2005 Saab 9-3 we are going to install part number 119176, the modulite protector from Tow Ready. We are also going to install part number 118151, the accompanying install kit. Our wiring is going to be installed behind the taillights on both sides. We are going to get left turn, running lights, brake signal, and ground on the drivers side and we will run a lead over to the passenger side to get the right turn signal. :24
So we will have to disassemble the interior components in the trunk area and then start our wiring process. To get to our wiring harness what we are going to do is take apart the interior panels on the drivers side and the bottom panels just so we can get access to it. We can get all the circuits we need on the drivers side. You can see here those are the wires that go to the tail light on the drivers side, those will be the wires we will be making our connections to. Down along the threshold are the wires that go across to the passenger side of the vehicle. We are going to pick up our right turn signal from over here. :55
First thing we are going to start off testing is for our running light circuit. We have our running lights on, lets do some testing. Now that lights up my tester about half way. Lets try a different one, that does the same thing, so that tells me this is probably a multiplex system, which means the two wires are doing the same thing, but one wire could have two functions. Lets go ahead and hit the brake signal and see if we can get one of the wires to light up. Okay, lets test the purple wire first. The purple wire got more power with the brakes on, so that wire is doing the running light and the brake signal. So we will use that purple wire for our brake signal. On the modulite it is going to be our red wire. We will go ahead and make our attachment to the purple wire for our brake lead, we will use a quick splice to do that with. All right lets check our blue wire on the car, so that is for running lights. That was only doing 6 volts so that is our running lights, we will hook up our brown wire to that. Now lets go find our turn signal. The brown wire is going to be our left turn signal, so we will hook up our yellow wire on the modulite to the brown wire on the car. All right lets look for our right turn signal. We know the wire comes across so just we need to check which color. It looks like the orange color wire so we will trace that all the way back, down and across and we will make our connection to that. That is going to be the green wire coming off the modulite. Check our signal one more time. For our ground, we are going to use a factory ground that is already provided right here. So go ahead and loosen that up and ground our white wire. 2:53
We will go ahead and start mounting our box up and running our wire. What we are going to do is sneak this 4 pole behind it, behind this box here. There is an opening here so we might as well use that to our advantage. We will take our converter box here and mount it to the sheet metal right behind it. We need to make access to this right here because this is where we start installing our 118151 install kit. This wire here is going to be run to the front of the vehicle to the battery. There is a grommet right here which is perfect for this situation. Lets go ahead and poke a slit in it with our knife and we will just push our wire through. Go ahead and push our wire through and out the bottom of the bumper for now. Go ahead and route it up and make our connection with the crimp fitting. All right I have plenty of slack there now, all I need to do is go underneath the vehicle and run it to the front. The wire came out the grommet, ran alongside the hitch, goes toward the front of the vehicle, staying away from any moving parts like the suspension components, and we will follow it along the bottom of the vehicle here. We found this channel on the bottom of the cabin and we just pushed it in and came out all the way down toward the front of the vehicle. Go over to the exhaust and reach down from the top on the engine compartment and pull the wires up. We ran our wire up alongside the firewall making sure we stayed away from steering components. We came up behind the brake booster here and we just zip- tied to this wire harness here, we have plenty of leader left over. So now we need to get access to the battery. 4:44
So take the cover off the battery and we are going to tie up to our positive post on our battery. Before we do any electrical work we want to go ahead and disconnect the battery by taking apart the negative side. Now we can work on the positive side, lets take that nut loose and just leave it alone for now. Then we will get our fuse holder. To get our fuse holder ready go ahead and cut the loop in half and strip the wires back so we can put on our ring terminal and butt connector. Do the butt connector first. Then we will do our ring terminal. Now we will go back to our black wire, cut off the excess and we will strip the wires back. Install our fuse holder. Hide it right next to that battery. Put our ring terminal back on and then the nut. Install our fuse. And reinstall our negative terminal. Put our cover back on. The last thing that remains is go ahead and test our wire harness with a light tester then the trailer. All right and with that that finishes our install of part number 119176 and 118151 from Tow Ready.