Seemingly seems a bit unusual giving issues being the engine is cold but odder things do tend to happen unexpectedly being a boat.
Glad you stayed with it to find the solution…
How did you come to the conclusion it’s a TKS diode issue?
https://yanmarshop.com/catalog/media/F53DEL3GOJSW4Y3INVQXE2LOMUXW2ZLENFQS6YTNMUXUOQKZIRBVQQSRI5JE6RCFJVBFCR22J5CUWVCTG5DUCMSBFZYGIZQ
See item numbers 7…. Might need your engine serial number to fine tune the correct part but in general you ought to be able to buy a new or used one probably on eBay using the part number...
Take a jumper wire at the back of the key switch and connect terminals B and A, then take another jumper wire and connect to terminal B and touch terminal S (Start) and see if the engine starts normal.
Also right now, when you turn the key to just on (ignition) do the gauges power up? No? Then...
Here's your parts catalog for your serial numbers...
0B849523 = https://www.mercruiserparts.com/3-0l-gm-181-i-l4-1987-1989-0b450801-thru-0c856558
0B934426 = https://www.mercruiserparts.com/r-mr-alpha-one-sterndrive-1983-1990-6225577-thru-0f386995
^One in the same as,
0B943249 =...
Wondering if someone’s been switching wires at the key switch as the colors seem off to me unless I’m going colorblind in my old age ha ha… the colors seems backwards between the I and A.
This question on post 61 seemed to go unanswered...?
As in some reference, is item numbers 2 and 3 in place?, https://www.mercruiserparts.com/bam/subassemblydetail/37744147/28149300
https://www.ebay.com/itm/135583030541?msockid=3e043f2b2586627b2de92ee9241463e0...
Should you pre-fill with fuel if possible, yes to help avoid pump stress / heat / early wear out… do you have to, no… with many key on key off cycles, it should self prime.
http://download.brunswick-marine.com/filereader/file/pdf/5/enen/mercruiser/gasoline/879288300/879288300_5c.pdf
Though rare, there are some (mostly 3.0 models) that had the gear lube oil reservoir as an option and sometimes it seemed dependent on boat model too when say ordered from new.
If I recall correctly, sometimes having the three serial numbers from Mercruiser might distinguish if it didn’t come...
Now you have to be careful that the paint didn't make its way to the injector....Again?... Also you may have to clean the inner fuel rail and the fuel damper on the rail (that's similar to a regulator) as you wouldn't want to lose it's needed performance... I believe you can open the one up on...
At the moment there is an internal issue with the website itself that won't allow new photos to load under normal circumstances...generally when this happens (as it seems to happen roughly once a year now until repaired by IT techs) you may have to use an outside source to load your photos then...
Volvo calls them a trailering bracket and though I can't confirm this visually as noting shows an image online, I suspect the Merc part number/s for the Trailering Hook are/were 86459, 86459A1, 86459A2 which all three numbers jumps to the plastic clips for the rams for the MC-I, R, MR, Alpha...
Unfortunately these types of issues (photos & emails mostly) ((but a few others too)) that arise every so often like this are scheduled timely events pre-set up by former iboats administration team for rumored to be security reasons and in transition it can honestly only be guessed that the new...
