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-   -   496 HO, NO Crank, No start (https://www.offshoreonly.com/forums/general-q/379926-496-ho-no-crank-no-start.html)

compedgemarine 07-16-2023 05:47 PM

just to make sure, are these mechanical or dts and or smartcraft? on the diagram i found for a 14 pin mechanical it shows a slave relay I believe up next to the pcm with the other relays. also just to make sure, is it having a kill switch problem? if you have a single kill switch for both engines it is a double pole switch so one side could be dead.

fountain38express 07-16-2023 06:11 PM


Originally Posted by compedgemarine (Post 4873476)
just to make sure, are these mechanical or dts and or smartcraft? on the diagram i found for a 14 pin mechanical it shows a slave relay I believe up next to the pcm with the other relays. also just to make sure, is it having a kill switch problem? if you have a single kill switch for both engines it is a double pole switch so one side could be dead.

smartcraft, my issue has started since i just reinstalled the engines, port motors runs great, starboard wont crank. I have to of missed a connection, but I cant find it.I have power at the ignition switch, alarm goes on, fuel pump runs, just wont crank. I have power at the relay on both yellow/red and red/purple wires. I have swapped relays with port motor. I am at a loss. Need schematic to trace the other wire on the relay.

compedgemarine 07-16-2023 07:34 PM

so I am assuming that the yellow/red only has power when the key is turned to start. the red/purple is constant power so that is there. there should be a second yellow/red that goes to the solenoid on the starter and there should be a ground wire. maybe missing the ground as in the diagram above with the transmission the ground is thru the neutral switch and is the yellow/black but on a bravo the ground should be permanent and the neutral is in the yellow/red.

fountain38express 07-16-2023 09:31 PM


Originally Posted by compedgemarine (Post 4873491)
so I am assuming that the yellow/red only has power when the key is turned to start. the red/purple is constant power so that is there. there should be a second yellow/red that goes to the solenoid on the starter and there should be a ground wire. maybe missing the ground as in the diagram above with the transmission the ground is thru the neutral switch and is the yellow/black but on a bravo the ground should be permanent and the neutral is in the yellow/red.

My relay wiring is as follows: 30 pin is red/purple , 85- yellow/black, 86- black/yellow and 87- yellow/red. Here are some pics, I included a picture of my nuetral safety switch wiring.
https://cimg9.ibsrv.net/gimg/www.off...2c77e0ed28.jpg
https://cimg1.ibsrv.net/gimg/www.off...2a55b22669.jpg
https://cimg8.ibsrv.net/gimg/www.off...1aba2fcfe0.jpg



compedgemarine 07-16-2023 10:15 PM

red/purple should be constant power, yellow/red goes to the starter. if you remove the relay and jump those two the starter should spin. the other two activate so we need to know which is which. thinking the black/yellow is ground but hard to tell. take a test light and go to battery pos. and one of those should light as the ground. the other should light when the light is on ground and the key is start. hard to tell on the neutral switch, assuming the purple are the switch itself but what are the colors on the other side, look like maybe black/yellow and yellow/red?

fountain38express 07-17-2023 09:45 AM

Yes that is correct, neutral switch is yellow/red and black/yellow

fountain38express 07-17-2023 09:53 AM


Originally Posted by compedgemarine (Post 4873511)
red/purple should be constant power, yellow/red goes to the starter. if you remove the relay and jump those two the starter should spin. the other two activate so we need to know which is which. thinking the black/yellow is ground but hard to tell. take a test light and go to battery pos. and one of those should light as the ground. the other should light when the light is on ground and the key is start. hard to tell on the neutral switch, assuming the purple are the switch itself but what are the colors on the other side, look like maybe black/yellow and yellow/red?

You are correct, my problem is the yellow/black wire that should light when key is in start position does not, no power. I dont know what to check, any idea where that wire goes? Is it fused? Thank you for your help on this!
Dan

compedgemarine 07-17-2023 10:15 AM

if i am following correct then the black/yellow should light at the relay when key is in start. if it does then the yellow/black should be a ground as it is on a trans version which would mean that it is not connected to ground. is this the correct harness? I had a 496 here a while back that was originally a trans engine but was now wired for bravo and they had to find the original wires for the trans neutral switch and tie them together

sgett775 07-17-2023 05:34 PM


Originally Posted by compedgemarine (Post 4873552)
if i am following correct then the black/yellow should light at the relay when key is in start. if it does then the yellow/black should be a ground as it is on a trans version which would mean that it is not connected to ground. is this the correct harness? I had a 496 here a while back that was originally a trans engine but was now wired for bravo and they had to find the original wires for the trans neutral switch and tie them together

Im using my sons login, Acually, the yellow/black should light when key is in start position. I verified this on my port motor. I followed the yellow/black wire to the 14 pin connector, it turns into a yellow/red wire on the helm side of the wiring. Im going to check power at the neutral safety switch on my shifter to see if there power from the ignition switch in start position. Do you know if this is fused or not? This is what Im thinking anyway. If you have any other ideas, please let me know, I do appreciate your input.
Dan

compedgemarine 07-17-2023 06:03 PM

never seen a fuse on any start circuit before. if the yellow/black at the relay is hot for start and if you have that at the relay make sure the black/yellow is a ground. if the yellow/black is not hot when the key is in start then you are losing it at the neutral or a wire broke somewhere.


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