2003 T/S Top Gun starting issue
 

Hoping someone can help as I am out of ideas. Twin 575 SCI's just rebuilt at Innovation. Both motors run good with no issues. Problem is when starting. Start one and let idle. When go to start other, sometimes it will kill running motor. Does not matter which one I start first. Does not matter what the battery position is on. I am having a hard time isolating batteries to individual motor. Even when disconnect large ground from between motors, and have battery switch set on 1 for port and 2 for starboard, when go to start non running motor, I can see voltage drop on running motor???? Change batteries, same issue. Both alternators are putting out 14 vt. Checked all grounds. Both starters turn over quickly and each individual motor will start immediately. I am sure I am missing something. Ideas?

Thanks in advance.

Ed

Did this issue just start ? new boat to you ? sounds like voltage is being pulled from the ignition system on the running engine when trying to start the other one

I'd be on the phone with Innovation like this, :D

https://cimg8.ibsrv.net/gimg/www.off...82b1009b4f.jpg

Yes, this just started after I installed. This is not an Innovation issue. I pulled motors, they rebuilt and I installed. Started then. It has got to be something on install but I can't figure out. I have pulled and installed dozens of motors in Cig's so it has me baffled. Agree on voltage drop. Will keep trying to find.

Ed

Id check the voltage on both batteries at idle, meaning no load, where do you have the ground cable from the batteries rear stud on the bellhousing ?

I had a stud connection to bell housing not clean enough because engines were repainted after rebuild once. I had to sand around stud, apply dielectric grease and reassemble. I know it sounds simple, but many times it is.

Yes, on stud at bell housing. Innovation did just about powder coat everything. I will check. Thanks

Ed

Have you tried it with both batteries to #1 ???

On my AT, #1 on each switch is the primary battery for each engine. #2 on each switch is for the other engine's battery.
If I have one switch on #1 and the other on #2, they are both using the same battery.

Not sure how Cig wires their batteries and switches.

My Cig is also wired this way.

Interesting. This is my second year for this Gun. I always ran all switched on both and never had this issue until installed motors this spring. I will try both on 1 and see what happens

Thanks.

Ed