Wiring diagram of SJ dual bilge pumps?

[x2ryder]

I am installing a second bilge pump on my 98 SJ. I have the Blowsion dual bracket. Can someone show or tell me how to run the brown (positive wire)? I grounded both negatives to the midshaft bolt.
Thanks

 

[Matt_E]

Run it the same way as the brown wire on your other bilge pump.
Since you have the ground directly to the engine, I am guessing that your positive is switched.
So you would run the brown wire to your bilge pump switch, to the same terminal that the other pump runs to.

 

[x2ryder]

Thats what i thought but of I spice into the other brown wire how do I connect the 3 now cut wires? Do you get what I am saying?

 

[Matt_E]

Use a butt connector to splice them.

 

[x2ryder]

So put 2 wires in one end and one in the other?

 

[OCD Solutions]

Yup, if you use a yellow heatshrink splice, there is enough glue to seal between the two wires and keep it all watertight still.

 

[Shifty]

If you connected the black bilge pump wires to the midshaft bolt you will not get a ground there. You shold be running your grounds back to the negative on the battery or somwhere on your engine, ebox, etc.

All you need to get this working is a good ground for both of your pumps. A fused positive wire (tapped from battery or E-Box) enter one side of switch and out the other side splicing into your two pumps.

Get some quality adhesive heatshrink type butt connector and insert your two browns (coming from bilges) into one side. From the other side, run just one wire up to your switch. You can usually manage to get two wires inserted correctly into a butt connector. Another option is to solder the three wires together and again use some good heatshrink.

 

[Matt_E]

If you connected the black bilge pump wires to the midshaft bolt you will not get a ground there.

I am assuming he mean the midshaft cover mount bolt(s). Those connect directly to the cases, providing a ground if the engine is grounded properly.

 

[x2ryder]

I used to just ground my single pump to the bolt on the coupler cover. It work fine. Whats the difference between grounding it to the midshaft and or the coupler cover?

 

[x2ryder]

ok nevermind matt just answered my question.

 

[SJBrit]

The other way to make a waterproof joint is to use a simple crimp butt connector, but fill it with silicon sealant first. Fill it, insert wires, crimp and allow to cure for a nice watertight connection.

 

[Sospikey]

The midshaft is not electrically connected to the battery in any way. Fibre glass has poor conductivity. Use the battery terminal or metal part of motor for ground. Make sure it is clean and without corrosion or paint.

 

[Matt_E]

The midshaft is not electrically connected to the battery in any way.

Read posts #8 and #9.

 

[SJBrit]

I like Matt's way of pulling power and ground from the e-box through the temp sensor grommet. I just did that on mine and it makes for a very clean installation. MUCH better than running power from the battery.

 

[Matt_E]

Yup. :biggthumpup:

 

[Shifty]

One thing to consider when grounding anything to the coupler cover bolts... I don't know if it was an isolated incident or what but I had two ring terminals attached there; grounding my two pumps. I noticed I lost one pump while riding, after checking I found one severed completely leaving just the "ring" attached and the other had a tear in it and was on the verge of breaking as well.

I think this was caused by work hardening of the copper (engine vibration) which is common. There was plenty of slack to allow for motor movement but they failed within months of the original install. I relocated them to my TL mounting plate and have had no problems.

This may not be an issue but for me it was.

 

[Matt_E]

That's why I don't ground pumps to the engine. I've had them break in the past.

 

[H2SUT]

I like Matt's way of pulling power and ground from the e-box through the temp sensor grommet. I just did that on mine and it makes for a very clean installation. MUCH better than running power from the battery.

Once in the electrical box what do you attach to? Or will it be clear once I get in there. Doing the same setup this week...

 

[Matt_E]

Power comes from the starter relay and ground comes from the ebox grounding posts (where all the other ground lugs go).

 

[Dustin Mustangs]

I added a fuse in there too just in case that wire gets pinched.