HyFive578

iTrader: (3)

Yesterday, I blew another one of the AGI boxes on that same motor. All three motors have these boxes. The starboard and center motor have a CAN bus wire that runs from the dash to the back of the motor right by the ECM and have a plug that looks exactly like the plug on the AGI. The port motor (with the problem) has a "terminator" plug on the end of it near the ECM rather than plug into the harness. This is the second time in a week; something is definitely wrong. Any ideas on how to trouble shoot this?

Dean Ferry

I have a similar problem, port 600SCi runs, but no gauge operation, going to swap the Analog interface module and see if problem goes to SB engine

Dean Ferry

Rob,
Did you ever figure out what the problem was?
Thanks,
Dean

VoodooRob

That was on our 353 Formula I sold the boat and the next owner fixed it by changing AGI box.

Dean Ferry

Thanks for the data Rob!

Dean Ferry

so my AGI's are Part Number 892486A02, but I can't seem to find them on the web...

Genuine Mercury & Mercruiser parts. Analog Gauge Interface Digital Engines

This is all I can find? Plus I just need the AGI, no the harness also...
Thanks,
Dean

HyFive578

iTrader: (3)

Back in 2014, I spoke with Mercury extensively about this problem and they had told me that they had instances of voltage spikes caused by drive trim pumps and had recommended I put a transient voltage suppressor on the drive trim pump. At the time, all of my 12V accessories including drive trim, trim tabs, etc, were all connected to the port engine battery and the port AGI was the one failing. I installed the TVS and and guess what, I blew another AGI after that. My ultimate solution was to install another battery and run a dedicated circuit to isolate all 12V devices and limit the engine batteries to just starting the engines. I have not had another AGI fail since and that was 3 years ago.

Dean Ferry

H5,
Thanks for the input, hopefully I won't have to go to the same route as you, I hopefully will get my new AGI ordered today, just need to confirm if the part number I have is correct....

VoodooRob

I researched the AGI box thru Livorsi

Dean Ferry

Rob,
I talked w/ "Marty" at Livorsi, and we couldn't figure it out, I Bing'd it, and Hardin marine had the data, ended up calling Merc racing, talked with "Allen"and found out that I can't just buy the AGI Module anymore, NOW I have to buy the whole installation kit, P/N: 892486K04...... which has the AGI module in it, along with crap I don't need, gotta love Merc racing!