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How many amps does a trans brake solenoid draw? #464943 09/10/09 02:16 PM 09/10/09 02:16 PM
Joined: Feb 2004 Posts: 1,417 Chicago, IL blownEFI OP pro stock
blownEFI OP pro stock Joined: Feb 2004 Posts: 1,417 Chicago, IL	Trying to figure out what size fuse to use in my trans brake circuit. The wires on the solenoid look so tiny (22 guage??) it makes me think it can't be drawing much current. Does anyone know? "These go to eleven", Nigel Tufnel

Re: How many amps does a trans brake solenoid draw? [Re: blownEFI] #464944 09/10/09 02:30 PM 09/10/09 02:30 PM
Joined: Jan 2003 Posts: 302 Northeast Texas MoparMuscle enthusiast
MoparMuscle enthusiast Joined: Jan 2003 Posts: 302 Northeast Texas	Measure the resistance with an ohm meter. Then divide voltage (12 volts) by the resistance and it will tell you what the amperage draw is I = E / R Amps = Voltage divided by resistance. 100% Mopar No Juice Added 2016 Challenger R/T Blacktop 5.7 6 SPD 2009 Ram 1500 5.7 http://moparmuscle.biz

Re: How many amps does a trans brake solenoid draw? [Re: blownEFI] #464945 09/10/09 02:31 PM 09/10/09 02:31 PM
Joined: Mar 2006 Posts: 9,910 Eighty Four, PA B G Racing master
B G Racing master Joined: Mar 2006 Posts: 9,910 Eighty Four, PA	Don't know the draw but 5amp fuse is recommended [IMG]http://i430.photobucket.com/albums/qq21/ajcasini/max_zpsdppwd9km.jpg[/IMG]

Re: How many amps does a trans brake solenoid draw? [Re: B G Racing] #464946 09/10/09 06:52 PM 09/10/09 06:52 PM
Joined: Jan 2003 Posts: 4,616 Kissimmee Fl. D dusturbd340W5 master
dusturbd340W5 master D Joined: Jan 2003 Posts: 4,616 Kissimmee Fl.	the instructions that came with my Tranz Act brake says the solinoid draws 7 amps and to use a 16 gauge wire or larger with a 25 amp fuse 70 duster full chassis super pro 416 CNC Indybrock heads 727 w/brake best so far 1.212 60 6.219 in 1/8 at 110.88 9.768 at 137.81 1/4

Re: How many amps does a trans brake solenoid draw? [Re: blownEFI] #464947 09/10/09 07:07 PM 09/10/09 07:07 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	If it was a glide, they use some serious solenoids that can draw as much as 20 amps

Re: How many amps does a trans brake solenoid draw? [Re: MR_P_BODY] #464948 09/10/09 07:37 PM 09/10/09 07:37 PM
Joined: Dec 2006 Posts: 4,647 aotearoa rebel master
rebel master Joined: Dec 2006 Posts: 4,647 aotearoa	A&A ultimate brake draws 2 amps.

Re: How many amps does a trans brake solenoid draw? [Re: MR_P_BODY] #464949 09/10/09 08:00 PM 09/10/09 08:00 PM
Joined: Feb 2004 Posts: 1,417 Chicago, IL blownEFI OP pro stock
blownEFI OP pro stock Joined: Feb 2004 Posts: 1,417 Chicago, IL	I have a JW Ultraglide but I don't know who makes the solenoids they use. The wires are so teency small, maybe even 24 or 26 gauge little white wires, just doesn't seem like they could handle much current. "These go to eleven", Nigel Tufnel

Re: How many amps does a trans brake solenoid draw? [Re: MoparMuscle] #464950 09/10/09 09:01 PM 09/10/09 09:01 PM
Joined: Nov 2004 Posts: 4,330 Lynchburg, VA Leon441 master
Leon441 master Joined: Nov 2004 Posts: 4,330 Lynchburg, VA	Quote: Measure the resistance with an ohm meter. Then divide voltage (12 volts) by the resistance and it will tell you what the amperage draw is I = E / R Amps = Voltage divided by resistance. Not trying to bust on you or anything but you can't use these figures for any kind of coil. A coil which is what is in the solenoid or any relay takes a different amount of current to maintain it than to energize. Your formula works for maintaining but that is not the max current which is what you need to fuse for. Personally I fuse at 30 amps. I am not trying to protect the circuit so much as just prevent a complete meltdown. If you really want to know hook a Simpson or equivalant anolog current meter capable of 30 amps DC in series with you solenoid. Move the stop on the meter to just below what you are seeing the meter go to when you apply the t-brake. Keep reapplying the t-brake and moving the stop until you see no movement in the meter hand. This is peak current. Then multiply this figure by 1.20 and use wire and fuse rated for that current. If your digital meter has a 30 amp capability and a hold maximum feature. You can hook the meter up set it for hold maximum apply the t-brake and get the peak current a little easier. This is how we read relay current when we do not have a testset available on signal systems. You could also do this and take note then check your solenoid every so often as we check relays at work to make sure they are in good condition. GUESS WHAT I have never applied this to the race car. Why, because I run 10 gauge wire and a 30amp self reseting circuit breaker and know it will always work. Been bitten by a failed fuse once not again. Leon Career best 8.02 @ 169 at 3050# and 10" tires small block power.

Re: How many amps does a trans brake solenoid draw? [Re: Leon441] #464951 09/11/09 01:34 AM 09/11/09 01:34 AM
Joined: Dec 2005 Posts: 11,551 Fulton County, PA C CMcAllister Mr. Helpful
CMcAllister Mr. Helpful C Joined: Dec 2005 Posts: 11,551 Fulton County, PA	Just checked a 2 wire Glide solenoid the other day while doing some electrical work on a car. 10 amps, don't recall the make, TCI or Trans Specialties maybe. I agree with just using a 30 amp fuse or breaker to keep from burning everything up in case of a dead short. If the results don't match the theory, change the theory.

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