Biondo Terminator Button Wiring

kingsransomracing · 04-08-2009, 09:29 PM

How are you guys wiring your biondo button to you transbrake solenoid. The biondo button uses a microswitch which is designed to carry < 1A and the solenoid requires 6-8Amps (Griner). Anyone have a schematic (wiring diagram) for how they have theirs hooked up?

SGSST109E · 04-08-2009, 09:47 PM

Just used a relay, let the switch controlthe relay coil. The trans brake runs thru the N.O. contacts

kingsransomracing · 04-08-2009, 10:10 PM

Ok...so something like this:

My other thought is if I added a diode between the T-brake solenoid and the line-loc I could eliminate a relay...like this....what do you think?

should I put the revlimiter on the same side as the solenoid?

Bill Harris · 04-09-2009, 08:20 AM

Just so you know, technically, according to the rules, it is illegal to have a relay in the transbrake wiring. Section 8:2 in the rulebook is pretty clear about the acceptable wiring for a transbrake on cars without delay boxes, and it calls for a single continuous wire between the switch and the solenoid, with one splice allowed for the two-step. Additionally, the rules call for the wiring to be completely separate from any other wiring and fully visible.

Now, who knows if any of the tech guys pay any attention to the rule or ever check the transbrake circuit, but they could.

It could be argued that a relay is a delay device since there is a finite amount of time that it takes for the relay to energize/de-energize and if you were really desperate you could test a bunch of different relays from various manufacturers and use the relay to tweek the car's reaction time.

Don't shoot the messenger..

kingsransomracing · 04-09-2009, 09:01 AM

I would be interested to know how all of the super stock guys are doing it then, because the biondo switch isn't designed to power a solenoid directly.

Bill Harris · 04-09-2009, 09:27 AM

Dunno what people are doing, probably whatever they want until someone tells them they shouldn't, which is the usual NHRA procedure.

BTW, the way the rules are written it also makes it illegal to apply the transbrake and the linelock simultaneously since you can only have a single splice specifically for the two-step. Technically this is also true for stockers using a two-step, but I know of people who engage the linelock with the two step (at least they did before the rule change that required the button to be on the brake pedal).

kingsransomracing · 04-09-2009, 10:46 AM

Ok...I have got it figured out....turns out I was reading the microswitch current rating wrong. It states 10A / 125VAC,250VAC & .25A/250VDC .50A/125VDC

In a transbrake situation, the button is only activated for < 5 seconds which can handle 10Amps....so back to an easy circuit with no relays

Ed Wright · 04-09-2009, 10:47 AM

Mine has been connected directly for two years with no issues. To do other wise is not legal. Wires direct from the trans brake to the button, all wiring on top of the carpet in plain view, etc.

04-08-2009, 09:29 PM	#1
kingsransomracing Junior Member Join Date: Oct 2008 Posts: 14 Likes: 0 Liked 0 Times in 0 Posts	Biondo Terminator Button Wiring How are you guys wiring your biondo button to you transbrake solenoid. The biondo button uses a microswitch which is designed to carry < 1A and the solenoid requires 6-8Amps (Griner). Anyone have a schematic (wiring diagram) for how they have theirs hooked up?

04-08-2009, 09:47 PM	#2
SGSST109E Member Join Date: Jun 2007 Location: NJ Posts: 350 Likes: 62 Liked 126 Times in 61 Posts	Re: Biondo Terminator Button Wiring Just used a relay, let the switch controlthe relay coil. The trans brake runs thru the N.O. contacts

04-08-2009, 10:10 PM	#3
kingsransomracing Junior Member Join Date: Oct 2008 Posts: 14 Likes: 0 Liked 0 Times in 0 Posts	Re: Biondo Terminator Button Wiring Ok...so something like this: My other thought is if I added a diode between the T-brake solenoid and the line-loc I could eliminate a relay...like this....what do you think? should I put the revlimiter on the same side as the solenoid? Last edited by kingsransomracing; 04-08-2009 at 10:12 PM.

04-09-2009, 08:20 AM	#4
Bill Harris Member Join Date: Mar 2002 Location: Ooltewah, TN Posts: 421 Likes: 13 Liked 26 Times in 13 Posts	Re: Biondo Terminator Button Wiring Just so you know, technically, according to the rules, it is illegal to have a relay in the transbrake wiring. Section 8:2 in the rulebook is pretty clear about the acceptable wiring for a transbrake on cars without delay boxes, and it calls for a single continuous wire between the switch and the solenoid, with one splice allowed for the two-step. Additionally, the rules call for the wiring to be completely separate from any other wiring and fully visible. Now, who knows if any of the tech guys pay any attention to the rule or ever check the transbrake circuit, but they could. It could be argued that a relay is a delay device since there is a finite amount of time that it takes for the relay to energize/de-energize and if you were really desperate you could test a bunch of different relays from various manufacturers and use the relay to tweek the car's reaction time. Don't shoot the messenger.. __________________ Bill Harris ex 2172 STK ex 2272 S/S

04-09-2009, 09:01 AM	#5
kingsransomracing Junior Member Join Date: Oct 2008 Posts: 14 Likes: 0 Liked 0 Times in 0 Posts	Re: Biondo Terminator Button Wiring I would be interested to know how all of the super stock guys are doing it then, because the biondo switch isn't designed to power a solenoid directly.

04-09-2009, 09:27 AM	#6
Bill Harris Member Join Date: Mar 2002 Location: Ooltewah, TN Posts: 421 Likes: 13 Liked 26 Times in 13 Posts	Re: Biondo Terminator Button Wiring Dunno what people are doing, probably whatever they want until someone tells them they shouldn't, which is the usual NHRA procedure. BTW, the way the rules are written it also makes it illegal to apply the transbrake and the linelock simultaneously since you can only have a single splice specifically for the two-step. Technically this is also true for stockers using a two-step, but I know of people who engage the linelock with the two step (at least they did before the rule change that required the button to be on the brake pedal). __________________ Bill Harris ex 2172 STK ex 2272 S/S

04-09-2009, 10:46 AM	#7
kingsransomracing Junior Member Join Date: Oct 2008 Posts: 14 Likes: 0 Liked 0 Times in 0 Posts	Re: Biondo Terminator Button Wiring Ok...I have got it figured out....turns out I was reading the microswitch current rating wrong. It states 10A / 125VAC,250VAC & .25A/250VDC .50A/125VDC In a transbrake situation, the button is only activated for < 5 seconds which can handle 10Amps....so back to an easy circuit with no relays

04-09-2009, 10:47 AM	#8
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 389 Times in 169 Posts	Re: Biondo Terminator Button Wiring Mine has been connected directly for two years with no issues. To do other wise is not legal. Wires direct from the trans brake to the button, all wiring on top of the carpet in plain view, etc. __________________ Ed Wright 4156 SS/JA Last edited by Ed Wright; 04-09-2009 at 10:48 AM. Reason: Spelling. I'm old.