I'm going to have my fog lights as DRL's.

I have the wiring diagram using the Bosch relay .
( I googled bosch relay) the diagram is there.

I want to have the connection to the relay (with the key on).

What fuse can I tap into that will give me the key on connection to the relay via #12 or #14 wire from fuse to relay.

Can I get that connection using the fuse box under the hood , or will I have to get it from the dash.

One of the posts showed a wire that had a built in fuse holder, that pluged into fuse box resulting in a wire that taps into fuse box with a fuse to that wire and a fuse in that circuit.
I probably will use that type of set up?

Thanks for any input

 

You can get a power tap off of the AIC plug stowed under the dash. It is located right above the brake pedal area on the cross member. You can then run a wire to one of the customer access wires behind the fuse panel which run out to the bundle right by the master cylinder. You can then splice into it for your relay. Or you may find it easier to just run your own wire through the firewall.

Connector is near the yellow Zip Tie in this pic.



Power is off this Pin.






Customer Access Wires under dash




Engine Compartment

 

Thanks for the info.

I can splice into wire prior to plug?
Run my own wire to relay.
#12 or #14 wire?
Considered to be low draw from plug to relay?
Is customer plug fused? What amp?

 

Yes, you can tap into the wire directly.

You only need 18 ga or less wire as it is only signal.

Yes it is fused. Should be a 10 amp fuse! APCM circuit on an '02 is #45.

 

Thanks for the info.

I plan on running a #12 wire from #87 out of bosch relay, splicing into TAN/ORG fog light wire.

Seems to be the way to go?

I was going to put 9005 Halogen 65 w bulbs in stock fog light plugs.

Per the feed back on this forum the plugs can handle the 65 w bulbs.

The question I have is

1. #12 wire throughout
2. Will there be any issues with stock TAN/ORG wire with #12 wire to it .(heat build up on TAN/ORG wire). #12 to big or the bigger the better rule of thumb.
3. Is a 20 amp fuse enough with the 9005 bulbs or should I go to a 30 amp fuse from battery to #30 on relay.

Thanks again for your help.

 

#12 AWG wire is light for that circuit. Each bulb can pull roughly 5.4 amps, so with 10.8 amps draw from the bulbs + 20% safety factor you would be looking at 12.96 Amp load when they are on. So you should be looking at a 15 amp circuit. #12 wire is rated for roughly 9.3 amps. #10 AWG is rated at 15 amps, while #8 AWG is rated at 24 amps.

The other thing you should consider is the voltage drop. Using larger wire will keep the voltage higher. Voltage drop should always be less than 3% when sizing your wires. With the 12 AWG wire you would have a 4.9% drop, 10 AWG is 3.08%, and 8 AWG would be 1.93% drop in voltage (based on a 15' circuit).

Most relays are 30 AMP, so you are ok there. Just have a fuse at the battery that feeds the relay and you should be fine.

So if you run #10 AWG feed from the battery to the relay, and then to the light sockets you will be fine. #8 would be better but not required. You can run much smaller gauge wire from the ignition source as it is a low amp draw to trigger the relay. Size your fuse to protect your wiring! If you run a 15 AMP fuse you are right at the amp rating for the wiring if using 10 AWG wire. So I would recommend 8 AWG wire with a 15 AMP fuse for your circuit.

 

Thanks AGAIN.

I will use the #8 and 15amp fuse from battery to relay , per your suggestion below.

(So I would recommend 8 AWG wire with a 15 AMP fuse for your circuit.)

I purchased 9500 fog light socket from Autozone.

Since it is made in China and the wires appear to be the same size as my factory wires, should I use my existing socket and cut my factory hot wire and run my new hot to it.

Thanks again.

 

I would leave the factory harness alone if you already have new sockets. That way you can easily go back if you choose.

 

I agree.

Thanks for all the help.