Power supply to fuel cutoff solenoid

Joined
Nov 19, 2013
Messages
3
My 1975 FJ45 (early 2F engine) stopped idling recently. Eventually I discovered that if I hard-wired the fuel cutoff solenoid on the carburettor, the engine idled perfectly. The solenoid is OK, it seems. When I plug it in to its regular part of the wiring system, there's little or no power getting through: I've measured 0.23V at the connection before the solenoid.

Does anyone know if the solenoid should be getting reduced voltage, or if it should get 12 volts or so?

The power supply comes via the so-called computer, which I haven't yet seen because I haven't gone rummaging around under the dash for it. I'm sure it's not a computer as we know them today! But anyway, jumping ahead to the next question I'll probably ask, if the computer is the fault, does anyone know if there's a fix of some kind? Can I bypass it? Or is a replacement available?

Thanks.
 
Joined
Jun 29, 2014
Messages
634
Location
Cariboo BC
you should see 12+ volts at the solenoid.

We have limited electronics on the rigs up here and my 78 is just 12+ volts wired to the "ON" part of the ignition switch.
 
Joined
Nov 19, 2013
Messages
3
you should see 12+ volts at the solenoid.

We have limited electronics on the rigs up here and my 78 is just 12+ volts wired to the "ON" part of the ignition switch.
Thanks, Curt. Wiring it straight to the switch might be the smart solution.
 
Joined
Nov 19, 2013
Messages
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Easy, as it turned out. Blown fuse. I think I've fixed it, but when I went to fire her up there was no power at all. 12V+ at the battery but nothing anywhere else, not even the lights or horn. Bugger. Main fuse is fine. I hate electrics.
 
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Apr 2, 2008
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9,129
Location
Victoria, BC
Find the thread ----> Never Underestimate the importance of a ground.

If you're fuses are good that's what's in common with everything.
 

Living in the Past

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Apr 21, 2005
Messages
17,789
Also fuseable link may be blown as well as ground issue. If it blows you will loose everything as well. As for power to the idle solenoid should a place on the coil/igniter that gets 12 volts off the ignition switch. When I finally located a correct carb for my 68 after years of aftermarket carbs and early none solenoid I wired it the coil.
 
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