 Can you use a single pole master cylinder switch in an early car? |
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| IronHillRestorations |
 Aug 12 2020, 06:50 AM
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#1
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I. I. R. C.  Group: Members Posts: 6,719 Joined: 18-March 03 From: West TN Member No.: 439 Region Association: None 
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Can you use a single pole master cylinder switch in an early car that had a two pole?
New master cylinder has a single pole switch and the old (original) master cylinder had a two pole with two wires. I'm in a time crunch and thought I'd ask the group before digging into the wiring diagrams |
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| Spoke |
Aug 12 2020, 08:25 AM
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#2
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Jerry Group: Members Posts: 6,978 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None
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Yes you can. I have that now in my '71 with 19mm MC. You have to pick the correct wire to connect to. One of the wires is ground and the other is the bottom (negative) side of the warning light. Leave the ground wire hanging as the switch provides the ground return to light the warning lamp when a fault occurs.
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| messick |
Aug 12 2020, 11:13 AM
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#3
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Newbie Group: Members Posts: 39 Joined: 15-June 20 From: Orange, CA Member No.: 24,381 Region Association: Southern California |
The brown with white stripe is the wire you want to connect. The completely brown wire is the ground.
Coincidentally, I just hooked up by switch last night, so the wiring diagram is fresh in my mind. Although, I'm pretty sure all the completely brown wires in the car are grounds. |
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| IronHillRestorations |
Aug 12 2020, 11:28 AM
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#4
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I. I. R. C. Group: Members Posts: 6,719 Joined: 18-March 03 From: West TN Member No.: 439 Region Association: None
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QUOTE(Spoke @ Aug 12 2020, 06:25 AM)  Yes you can. I have that now in my '71 with 19mm MC. You have to pick the correct wire to connect to. One of the wires is ground and the other is the bottom (negative) side of the warning light. Leave the ground wire hanging as the switch provides the ground return to light the warning lamp when a fault occurs. Thanks! I was going to ground the brown wire, but if I don't have to, great. |
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| mepstein |
Aug 12 2020, 01:44 PM
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#5
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914-6 GT in waiting Group: Members Posts: 19,271 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region
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QUOTE(IronHillRestorations @ Aug 12 2020, 01:28 PM) QUOTE(Spoke @ Aug 12 2020, 06:25 AM) Yes you can. I have that now in my '71 with 19mm MC. You have to pick the correct wire to connect to. One of the wires is ground and the other is the bottom (negative) side of the warning light. Leave the ground wire hanging as the switch provides the ground return to light the warning lamp when a fault occurs. Thanks! I was going to ground the brown wire, but if I don't have to, great. I did a single pole mc on my '71. I just taped off the ground per world recommendation. Worked fine. |
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