brosol 30/31 carby problem with idle solenoid

charlie Casual Dubber

28 posts · joined Nov 2011 · 17 Jul 2013, 6:29 pm

#963533

hi

i have a 62 beetle with a 1300 engine. i was told it was a 6 volt but it has a 12 volt battery? the problem is i just put a new brosol carb on it and im only getting 8 volts at the cut off solenoid instead of 12, so the car wont idle. i have the solenoid wired to the hot side of the coil.

AA003 Custom Title Time!

1,189 posts · joined Oct 2011 · 17 Jul 2013, 6:39 pm

#963536

Is it on the + or 15 side of the coil?

Is it a standard coil or one with a resistor?

I read it on samba, so it must be correct.

Sometimes Volkswagen dealers sell spare parts. Amazing isn't it!😂

charlie Casual Dubber

28 posts · joined Nov 2011 · 17 Jul 2013, 6:59 pm

#963540

if your looking at the engine in the car, its on the right hand side, which has 9 volts when ignition is on, the other side has 0volts.

not sure about coil type, its silver with no name on it, maybe there is a resistor somewhere else dropping the volts for the 6 volt system?

psimitar Son of Jim - Creator of Good

2,506 posts · joined Jan 2009 · 17 Jul 2013, 8:28 pm

#963554

So the coil only has 9 volts? Or just the solenoid?

If only the solenoid then remove from the carb and use a test wire direct from the battery to the solenoid terminal and touch the solenoid body to a chassis earth point. Does the solenoid pull back in properly and do you get 12v at the solenoid?

If all of this is OK then either the coil to solenoid wire is eating 3v or the carb earthing is a bit crap and the resisance this creates is eating the voltage.

If neither of the solenoid tests work correctly then the solenoid is faulty.

madness is in the eye of the beholder 👍

charlie Casual Dubber

28 posts · joined Nov 2011 · 19 Jul 2013, 5:29 pm

#963711

ok thanks

yeah i did wat you said and the solenoid worked, so i will look into the quality of the earthing. is there anywhere else in the engine bay i can get 12v from?

psimitar Son of Jim - Creator of Good

2,506 posts · joined Jan 2009 · 19 Jul 2013, 6:39 pm

#963725

Depends on your year of engine. If generator with regulator mounted on genny or fanshroud then 12v output there otherwise no.

Did you say you got 12v at the coil positive? If so then the engines/gearbox earthstrap is working well so points towards earthing issue with carb. Twinport motor earth thru the centre manifold support bolt and singleport thru the cylinder heads. Try running an earth wire from the carb mounting stud to an engine case bolt. See if you get full 12v then. If so you defo have a carb earthing issue.

madness is in the eye of the beholder 👍

68AutoBug Beetle Restorer - Experience over 138\% - YIKES --

11,654 posts · joined Aug 2002 · 19 Jul 2013, 7:08 pm

#963730

charlie wrote:hi

i have a 62 beetle with a 1300 engine. i was told it was a 6 volt but it has a 12 volt battery? the problem is i just put a new brosol carb on it and im only getting 8 volts at the cut off solenoid instead of 12, so the car wont idle. i have the solenoid wired to the hot side of the coil.

Hi
Maybe all the power in the engine compartment is going thru a resistor?? so it will still work with 12 volts??
You must have a multimeter, so check out the power at the solenoid and put the other end of the lead to a screw in the tinware and the base of the generator stand to get a good earth..
If its still the same..??? check if You still have the earth strap under the gearbox... gearbox to chassis... that is what earths the engine.. and as suggested, run a heavy wire from the body to the engine...
If You find its still not 12 volts then there is a resistor somewhere ?? could be in the boot, behind the dashboard, or it could be near the battery [if a relay is used] so You would need to run a wire from the other side of the resistor to that idle solenoid..
I don't know what the thread is on the carburetor for the idle solenoid, as You could screw a bolt into the hole so it idles, or attach a wire to the tail lights, so you need to have the tail lights on to start the car, and drive it... lol
No One will steal that car... lol

Best of Luck

LEE

If You lived nearby I'd come and check it out..

- Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY---

modnrod Fahrvergnugen

978 posts · joined Mar 2011 · 20 Jul 2013, 7:58 am

#963767

68AutoBug wrote:Hi
Maybe all the power in the engine compartment is going thru a resistor??

Possibly.
It's called a 50 yr old bit of wire.........😂

I have seen people wire 6V Beetles with 12V to the starter and lights, but run everything else in the car off a resistor in front of the dash though.🤪

matberry Moderator Go hard or go home

8,114 posts · joined Mar 2006 · 20 Jul 2013, 11:10 am

#963783

My guess is you have a bad conection on power feed (big red wire) often the issue is where it loops off the back of the headlight switch, or at the fuse box, or contact at or on the ignition. It's the black wire that then powers the coil so it then runs all the way back to the engine. You need to track the circuit either from the coil to the ign sw to the fuse box to the headlight switch to the battery or the battery ---- to the coil and at every junction/connection, find the voltage drop. Somewhere your loosing 4 volts, could even be the battery terminla or ground strap etc etc. There won't be/unlikely a resistor droping voltage, and there is usually little wrong with 6 volt cables, they are actually thicker than 12 V hence more capable of carrying current

Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE

psimitar Son of Jim - Creator of Good

2,506 posts · joined Jan 2009 · 20 Jul 2013, 2:39 pm

#963802

Did you say you have 12v at the coil? If not then follow Matts advise. I was working off the idea that you had 12v at the coil.

madness is in the eye of the beholder 👍

charlie Casual Dubber

28 posts · joined Nov 2011 · 22 Jul 2013, 6:46 pm

#964039

9 volts at the coil, how about running the solenoid off the + on the generator?? that looses it volts when the engine isnt running.

thanks for all the different advice.

matberry Moderator Go hard or go home

8,114 posts · joined Mar 2006 · 22 Jul 2013, 6:53 pm

#964041

No good on gennie, that s un regulated voltage so will burn out the solinoid as it can see up to 17 volts. Fix the low voltage problem as it will only get worse and the coil will provide better spark etc etc. The bad connection could at worse burn your car down !

Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE