need help with eletrical on mercruiser 470

[stillhi33]

Hi I need help with my boats electrical. I have a 85 mercruiser 170HP/470 engine I'm trying to get it to run , i hook everything to it finally got it to start after i cleaned out the Mercarb 2 bb and it crank and started if you hold down the start switch when you let it go it stops running i don't know if there is another wire i missed to hook up or something else.i also have a question on the resistance cable listed in the manual that goes to the positive ignition coil ... where does that resistance cable go to??? thank you so much for listening

 

[jayrodoh]

Re: need help with eletrical on mercruiser 470

you need the resistande cable to feed ~9 volts to the coil when it is running. This will run from the ignition side of the keyswitch to the coil positive.

There is a wire from the starter or solenoid that feeds a full 12 volts to the coil when cranking, that is why your engine starts and dies when you release the starter.

 

[stillhi33]

Re: need help with eletrical on mercruiser 470

thanks for your help and quick response i appricieted quick question for the resistance cable to be 9 V is it coming from the slave starter solenoid or is it coming from the starting switch???

 

[bruceb58]

Re: need help with eletrical on mercruiser 470

It comes from the ignition position of the start switch.

 

[stillhi33]

Re: need help with eletrical on mercruiser 470

Thanks Bruce and Jay I found the wire got a straight line to the coil and it started and stayed on so thank again for help me so quickly