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Freeflydenny
Samba Member
Joined: October 18, 2012
Posts: 52
Location: Murrieta
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 Posted: Wed May 31, 2023 8:42 pm Post subject: 1961 dual master cylinder wiring |
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Hello, hoping someone can help..
Bought a new 1961 wiring harness. It only had 2 master cylinder wires. My master cylinder has 2 / 2 prong cylinders. Can I just hook it up to one or do I need some sort of splinter?
I figure it's easier to ask you all then to try a thousand different ways.
Thanks in advance..
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clockworkbox
Samba Member
Joined: July 12, 2020
Posts: 275
Location: Williamsport, PA
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runamoc 
Samba Member
Joined: June 19, 2006
Posts: 5600
Location: 37.5N 77.1W
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| Posted: Thu Jun 01, 2023 7:00 am Post subject: Re: 1961 dual master cylinder wiring |
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| Freeflydenny wrote: |
Hello, hoping someone can help..
Bought a new 1961 wiring harness. It only had 2 master cylinder wires. My master cylinder has 2 / 2 prong cylinders. Can I just hook it up to one or do I need some sort of splinter?
I figure it's easier to ask you all then to try a thousand different ways.
Thanks in advance..
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Those 2 prong switches don't have the 'idiot light in the dash feature'. You could pick one switch (either) and connect the two wires to it and have brake lights.
To connect to both switches will involve splicing wires and have two quick dis connects on each wire so the can be connected in parallel.
_________________
Daily driver: '69 Baja owned 44 yrs - Plan B: '81 Rabbit Diesel LS Deluxe - Plan C: '72 Ghia
Yard Art: 2 Sandrails
Outback: '69 Ghia - '68,'69,'70,'72 Beetle - '84 Scirocco, GTI - Pair of '02 Golfs-
VW Wiring = It's just wires |
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slayer61
Samba Member
Joined: June 01, 2021
Posts: 1015
Location: CA
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| Posted: Thu Jun 01, 2023 8:44 am Post subject: Re: 1961 dual master cylinder wiring |
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Hell. Connect 'em in series. It'll work that way too!
_________________
| Cusser wrote: |
... Most folks are idiots when it deals with electrical !!! |
| 67rustavenger wrote: |
3/4 race cam? What's missing, one of the lobes?  |
Paul
'68 Manx clone... Sears??
2276 built on AS21 case
W-125 w/ GB 1.25:1 rockers
Mahle forged pistons
CB 4340 crank
CB H beam rods
deep sump
44 HPMX
EMPI GTV 2 STG II wedge ports
CB Magna spark
1 5/8 merged collector w/ hater stinger |
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KTPhil
Samba Member
Joined: April 06, 2006
Posts: 33992
Location: Conejo Valley, CA
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| Posted: Thu Jun 01, 2023 11:35 am Post subject: Re: 1961 dual master cylinder wiring |
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Series: downside is any one fails and you lose brake lights... no redundancy.
Parallel: Redundancy means either will make your brake lights work. Downside is that you won't knew when one fails unless you check them periodically.
I vote parallel. |
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runamoc
Samba Member
Joined: June 19, 2006
Posts: 5600
Location: 37.5N 77.1W
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| Posted: Thu Jun 01, 2023 12:14 pm Post subject: Re: 1961 dual master cylinder wiring |
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| Quote: |
| you won't knew when one fails unless you check them periodically. |
After years of driving many different vehicles with dual brakes and having had 1/2 of dual brake circuit fail in some of them. There will be 2 'clues', one is the pedal goes WAY down to the floor (like you need to bleed the brakes down) and the seat upholstery will pucker underneath you at the same time.
_________________
Daily driver: '69 Baja owned 44 yrs - Plan B: '81 Rabbit Diesel LS Deluxe - Plan C: '72 Ghia
Yard Art: 2 Sandrails
Outback: '69 Ghia - '68,'69,'70,'72 Beetle - '84 Scirocco, GTI - Pair of '02 Golfs-
VW Wiring = It's just wires |
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Erik G
Samba Member
Joined: October 16, 2002
Posts: 13269
Location: Tejas!
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KTPhil
Samba Member
Joined: April 06, 2006
Posts: 33992
Location: Conejo Valley, CA
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| Posted: Thu Jun 01, 2023 2:37 pm Post subject: Re: 1961 dual master cylinder wiring |
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| runamoc wrote: |
| Quote: |
| you won't knew when one fails unless you check them periodically. |
After years of driving many different vehicles with dual brakes and having had 1/2 of dual brake circuit fail in some of them. There will be 2 'clues', one is the pedal goes WAY down to the floor (like you need to bleed the brakes down) and the seat upholstery will pucker underneath you at the same time. |
I didn't mean that one brake fluid circuit fails, I meant that the senders fail more often these days, and you won't know until the BOTH fail. |
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runamoc
Samba Member
Joined: June 19, 2006
Posts: 5600
Location: 37.5N 77.1W
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| Posted: Thu Jun 01, 2023 2:58 pm Post subject: Re: 1961 dual master cylinder wiring |
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| KTPhil wrote: |
| runamoc wrote: |
| Quote: |
| you won't knew when one fails unless you check them periodically. |
After years of driving many different vehicles with dual brakes and having had 1/2 of dual brake circuit fail in some of them. There will be 2 'clues', one is the pedal goes WAY down to the floor (like you need to bleed the brakes down) and the seat upholstery will pucker underneath you at the same time. |
I didn't mean that one brake fluid circuit fails, I meant that the senders fail more often these days, and you won't know until the BOTH fail. |
_________________
Daily driver: '69 Baja owned 44 yrs - Plan B: '81 Rabbit Diesel LS Deluxe - Plan C: '72 Ghia
Yard Art: 2 Sandrails
Outback: '69 Ghia - '68,'69,'70,'72 Beetle - '84 Scirocco, GTI - Pair of '02 Golfs-
VW Wiring = It's just wires |
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wdfifteen
Samba Member
Joined: January 26, 2019
Posts: 528
Location: Ohio
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| Posted: Thu Jun 01, 2023 4:34 pm Post subject: Re: 1961 dual master cylinder wiring |
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Go to your FLAPS and get two of these tandem connectors. (This picture is insanely oversized.)
Plug one onto each connector on one switch on the MC. Connect the one of the two wires you have to each tandem connector on the switch. Make jumpers to jump from each tandem connector to the terminals on the other switch. |
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KTPhil
Samba Member
Joined: April 06, 2006
Posts: 33992
Location: Conejo Valley, CA
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| Posted: Thu Jun 01, 2023 4:44 pm Post subject: Re: 1961 dual master cylinder wiring |
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I would recommend these insulated types. They stay more secure under vibration and won't risk a short to ground if they come loose.
https://www.ebay.com/itm/125312105464?chn=ps&n...GAQAvD_BwE
You make short jumpers to each switch, preferably using factory-style double crimps. |
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Freeflydenny
Samba Member
Joined: October 18, 2012
Posts: 52
Location: Murrieta
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| Posted: Thu Jun 01, 2023 5:08 pm Post subject: Re: 1961 dual master cylinder wiring |
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| Thanks All!! Much appreciated! |
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wdfifteen
Samba Member
Joined: January 26, 2019
Posts: 528
Location: Ohio
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| Posted: Thu Jun 01, 2023 5:27 pm Post subject: Re: 1961 dual master cylinder wiring |
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That looks like three male spades. That's not what you want. You want a female and two males. They do make shielded 2m 1 f connectors. |
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runamoc
Samba Member
Joined: June 19, 2006
Posts: 5600
Location: 37.5N 77.1W
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| Posted: Thu Jun 01, 2023 6:54 pm Post subject: Re: 1961 dual master cylinder wiring |
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| Quote: |
| That looks like three male spades. That's not what you want. You want a female and two males. |
if the 'jumper' wires have female on both ends why wouldn't what KTPhil suggest work?
_________________
Daily driver: '69 Baja owned 44 yrs - Plan B: '81 Rabbit Diesel LS Deluxe - Plan C: '72 Ghia
Yard Art: 2 Sandrails
Outback: '69 Ghia - '68,'69,'70,'72 Beetle - '84 Scirocco, GTI - Pair of '02 Golfs-
VW Wiring = It's just wires |
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slayer61
Samba Member
Joined: June 01, 2021
Posts: 1015
Location: CA
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| Posted: Fri Jun 02, 2023 6:47 am Post subject: Re: 1961 dual master cylinder wiring |
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Or... For the sake of simplicity... you could just bin one and put in a plug in it's place 
_________________
| Cusser wrote: |
... Most folks are idiots when it deals with electrical !!! |
| 67rustavenger wrote: |
3/4 race cam? What's missing, one of the lobes? |
Paul
'68 Manx clone... Sears??
2276 built on AS21 case
W-125 w/ GB 1.25:1 rockers
Mahle forged pistons
CB 4340 crank
CB H beam rods
deep sump
44 HPMX
EMPI GTV 2 STG II wedge ports
CB Magna spark
1 5/8 merged collector w/ hater stinger |
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wdfifteen
Samba Member
Joined: January 26, 2019
Posts: 528
Location: Ohio
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| Posted: Fri Jun 02, 2023 8:05 am Post subject: Re: 1961 dual master cylinder wiring |
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| runamoc wrote: |
| Quote: |
| That looks like three male spades. That's not what you want. You want a female and two males. |
if the 'jumper' wires have female on both ends why wouldn't what KTPhil suggest work? |
It could work. You would just have to make 4 jumpers with female connectors on each end instead of 2. There are multiple ways to skin this cat. Some are more efficient than others.
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Erik G
Samba Member
Joined: October 16, 2002
Posts: 13269
Location: Tejas!
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| Posted: Fri Jun 02, 2023 8:33 am Post subject: Re: 1961 dual master cylinder wiring |
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| slayer61 wrote: |
| Or... For the sake of simplicity... you could just bin one and put in a plug in it's place |
yep. That's what I do, and only use the one closest to the firewall / Pedal
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EVfun
Samba Member
Joined: April 01, 2012
Posts: 5474
Location: Seattle
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| Posted: Fri Jun 02, 2023 10:44 am Post subject: Re: 1961 dual master cylinder wiring |
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| wdfifteen wrote: |
Go to your FLAPS and get two of these tandem connectors. (This picture is insanely oversized.)
Plug one onto each connector on one switch on the MC. Connect the one of the two wires you have to each tandem connector on the switch. Make jumpers to jump from each tandem connector to the terminals on the other switch. |
I'm concerned about the strength and exposure of those so I generally use this style. (Ancor 230613 for when that link no longer works)
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| Wildthings wrote: |
| As a general rule, cheap parts are the most expensive parts you can buy. |
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scrivyscriv
Samba Electrician
Joined: October 04, 2011
Posts: 2922
Location: Memphis
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MANNAXMAN
Samba Member
Joined: March 25, 2009
Posts: 485
Location: Cali
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| Posted: Fri Jun 02, 2023 1:06 pm Post subject: Re: 1961 dual master cylinder wiring |
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| wdfifteen wrote: |
| runamoc wrote: |
| Quote: |
| That looks like three male spades. That's not what you want. You want a female and two males. |
if the 'jumper' wires have female on both ends why wouldn't what KTPhil suggest work? |
It could work. You would just have to make 4 jumpers with female connectors on each end instead of 2. There are multiple ways to skin this cat. Some are more efficient than others.
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This is how I wired my dual circuit MC. |
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