24 volt up trim...

**JohnR225** · 05-17-2002, 12:02 AM

Can anyone walk me though doing this on my 1996 225 ProMax? I run two 12 volt batteries in my rig and I am wired to use both to get 24 on the trolling motor. The engine and everything else is 12 volts.

Thanks in advance.

John Richied

**H2Onut** · 05-17-2002, 10:30 AM

http://forums.screamandfly.com/showt...5&pagenumber=2

http://forums.screamandfly.com/showt...ghlight=24volt

**JohnR225** · 05-17-2002, 11:30 AM

http://raceoutboards.com/images/24Vtrim.jpg

This one looks easy, thanks

John Richied

**H2Onut** · 05-17-2002, 11:54 AM

Its the same diagram !

**JohnR225** · 05-18-2002, 02:24 PM

Okay on my 1996 225 ProMax I have the two 16 gauge wires into the cowling. One wire goes right to the (+) side of the trolling battery. The other wire goes to the (+) side of the main battery then to the (-) side of the trolling battery.

I really dont see where to wire the two wires I have coming into the cowling now. I see the one from the (+) side of the trolling battery needs to go to the blue up side, but I have two trim relays (one up one down) under my ECU and looks like one main solenod where the starter leads hook up.Do I tape these into the relays?

I am going to go with all buttons 24V up for now and 12V down. That is if I ever figure this out .. LOL

John Richied

XB-2002-CP "Bad Magic"

Kennewick, Washington

**captcarb** · 05-18-2002, 06:05 PM

Before we get into this I need to know how you fastened the extra wires to the trolling and main batteries? You mentioned taping wires together in your post, and that is not safe. You may need some help fabricating the new wires using crimped on terminals which I also solder and cover with shrink tubing.

Be very careful you can create a short and start a fire.

**JohnR225** · 05-18-2002, 07:29 PM

Captcarb,
I did use the crimped on terminals. I just met I am not sure where to run the two electrical wire lines I have running into the cowling now.

Thanks for your concern, no shorts or fires wanted here .... LOL

**captcarb** · 05-18-2002, 07:53 PM

First, I think 16 gage is too light. I would use 10 or whatever is used now, it might be 12.

You only add two wires to the boat.

The jumper between the batteries.

The 24 volt wire from the extra battery to the up relay.

The 12 volt to the down relay already exists and we need to find it.

The trim relays have larger red wires going to them which are hot all the time. The 12 volt probably comes from the starter solenoid to one of the relays and then the trim relays are jumpered together. I do not have a promax wiring diagram in front of me, so I am going by memory and it might not be wired that way. You need to find the large red wires going to the trim relays and see where they come from.

You need to be absolutely sure about this because if you hook up 12v and 24v to the up relay at the same time that would be a dead short across the extra battery. So, if you do not understand what I am saying, please say so.

The 12 volt stays connected to the down relay, and is disconnected from the up relay.

Then the 24 volt wire, (the new one from the extra battery) is connected to the up relay. There may be a fuse in that existing wire. If so, incorporate it into the new wire.

It would be best if the extra battery is a stand alone battery used for nothing else. If you use the trolling motor battery you need to analize how the jumper wire between the batteries will affect the rest of that circuit. It sounds like they are already jumpered together for the trolling motor. If so, you don't need the additional jumper.