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 Engines, Electric, Plumbing, etc.
 interuptor switch
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Author Previous Topic: Fuel injector service Topic Next Topic: Best Way to Clean Holding Tank Probes?  - Resolved  

memaw777

RO# 15246

Posted - Sep 08 2019 :  17:48:01  Show Profile  Reply with Quote
1978 mercruiser 260 hp how do I know which interuptor switch I need I understand the old switch needs to be replaced with new shift plate and switch but which one

Homeport:

Sandy

RO# 1159

Posted - Sep 08 2019 :  22:09:33  Show Profile  Reply with Quote
Perhaps this will help ID the part #?:

https://www.sterndrives.com/shiftinteruptorswitchkits.html


Sandy

Homeport: The Vineyard Go to Top of Page

alien1952

RO# 32487

Posted - Sep 09 2019 :  10:43:44  Show Profile  Reply with Quote
Are you sure the switch itself is bad? using a meter it will red open, no continuity until depressed, then will read short , continuity
The switch grounds out the ign coil to aid in coming OUT of gear only .To use the new style switch you need to connect 12v to one side of the switch and the other side to the pos side of the coil to interupt the 12 volts
The new one is a normally closed switch vs the normally open old style


aka Bt Doctur

Homeport: nj Go to Top of Page

memaw777

RO# 15246

Posted - Sep 09 2019 :  14:46:01  Show Profile  Reply with Quote
I found the old switch probably the only one left in existence. the new one required me to change my trim pump thanks for your help


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alien1952

RO# 32487

Posted - Sep 09 2019 :  17:31:12  Show Profile  Reply with Quote
Ah, you must have the older MC1 type

aka Bt Doctur

Homeport: nj Go to Top of Page

memaw777

RO# 15246

Posted - Sep 12 2019 :  18:47:40  Show Profile  Reply with Quote
well I installed the new interuptor switch same problem evry time I goto neutral it dies I have made all the adjustments to cables if I try to bend the arm on the switch very slightly then it wont shift to neutral wondering if you guys think it could be a weak coil since the switch interrupts the coil maybe its to weak to come back any thoughts will be appriciated


Homeport: Go to Top of Page

alien1952

RO# 32487

Posted - Sep 12 2019 :  21:06:46  Show Profile  Reply with Quote
sticky shift cable or corrosion in the shift system

aka Bt Doctur

Homeport: nj Go to Top of Page

memaw777

RO# 15246

Posted - Sep 12 2019 :  21:52:46  Show Profile  Reply with Quote
can you lube the cable


Homeport: Go to Top of Page

alien1952

RO# 32487

Posted - Sep 15 2019 :  12:36:53  Show Profile  Reply with Quote
shift into F and pull the drive to inspect

aka Bt Doctur

Homeport: nj Go to Top of Page

memaw777

RO# 15246

Posted - Sep 20 2019 :  15:53:58  Show Profile  Reply with Quote
ok I had the cable replaced everytime I go to neutral it dies any ideas will be appreciated


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  Previous Topic: Fuel injector service Topic Next Topic: Best Way to Clean Holding Tank Probes?  - Resolved  
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