JPS wiring diagram

I believe it is similar to the Vintage Speedster wiring...I have that and I can send to your phone   pm me with number .

Here, I took a photo of my JPS wiring under the dashboard:

In all seriousness, you will want to do a bit of upgrading to your wiring. John doesn't use relays and seems to be colorblind when connecting random devices like gauges, wipers, horns...

Wiring colors appear to be similar to those used on my Spyder. Looking to see what fuses control what. As far as relays, I don't know what would need one other than the oil cooler fan. I built a dash harness for the Spyder and cut out lots of 16 gauge wire. Who would run a 16 gauge wire to a 3w lamp?

Alan Merklin posted:

I believe it is similar to the Vintage Speedster wiring...I have that and I can send to your phone   pm me with number .

Alan, one of the members sent me your email. Sounds like you've been doing this a long time. I did it a long time... along time ago.

Phone is 601/405-4008

Thanks,

Jim

Four pages sent to your phone

Jim Gilbert - Madison, Mississippi posted:

...As far as relays, I don't know what would need one other than the oil cooler fan...

Well, headlights, for starters.

You can get by without relays (old VW's did), but all modern cars use them, for a number of reasons.

First, your headlights will be brighter if you run the current for them through short runs of heavy-gauge wire. Relays allow you to do that.

But maybe more importantly, most of our replicas use cheap headlight switches whose contacts tend to fry if you send all of the current for the headlights through them. A nice, smoky fire can be comforting on a chilly, fall evening as long as it isn't under your dash.

Today, major manufacturers use relays as much to save money as anything else, as relays keep the runs of heavy (more expensive) wire to a minimum and allow the safe use of cheaper grade switchgear. But there are good engineering reasons for relays, too.

Terry Nuckels posted:

Here, I took a photo of my JPS wiring under the dashboard:

In all seriousness, you will want to do a bit of upgrading to your wiring. John doesn't use relays and seems to be colorblind when connecting random devices like gauges, wipers, horns...

No lie. Wiring by a colorblind blind man LOL!

"Colorblind"  I'm actually what is referred to as "shade color blind" ......That being primary colors are no problem, however grey can be green , purple can be violet, light blue can be light grey. Funny thing is I enjoy wiring speedsters....My salvation is if  not sure of a color I can place a white piece of paper behind the wire and "see" what color it actually is.  But yet in proper lighting, I can somehow paint blend a good color match on a car, go figure that ~

Jim Gilbert - Madison, Mississippi posted:

Wiring colors appear to be similar to those used on my Spyder. Looking to see what fuses control what. As far as relays, I don't know what would need one other than the oil cooler fan. I built a dash harness for the Spyder and cut out lots of 16 gauge wire. Who would run a 16 gauge wire to a 3w lamp?

 

Headlight relay (hi and low beam), horn relays, and oil cooler fan relay.

Robert M posted:

Jim Gilbert - Madison, Mississippi posted:

Wiring colors appear to be similar to those used on my Spyder. Looking to see what fuses control what. As far as relays, I don't know what would need one other than the oil cooler fan. I built a dash harness for the Spyder and cut out lots of 16 gauge wire. Who would run a 16 gauge wire to a 3w lamp?

 

Headlight relay (hi and low beam), horn relays, and oil cooler fan relay.

Only needed on Oil cooler fan. They weren't used on the VW or Porsche of the period. Only makes wiring more complicated. Too much junk wiring in these harnesses as it is.  

Jim Gilbert - Madison, Mississippi posted:

Robert M posted:

Jim Gilbert - Madison, Mississippi posted:

Wiring colors appear to be similar to those used on my Spyder. Looking to see what fuses control what. As far as relays, I don't know what would need one other than the oil cooler fan. I built a dash harness for the Spyder and cut out lots of 16 gauge wire. Who would run a 16 gauge wire to a 3w lamp?

 

Headlight relay (hi and low beam), horn relays, and oil cooler fan relay.

Only needed on Oil cooler fan. They weren't used on the VW or Porsche of the period. Only makes wiring more complicated. Too much junk wiring in these harnesses as it is.  

The relays for the lights allowed me to use a much brighter light without rewiring my Vintage. The original wires were pretty small, maybe 18 ga, and there was no way the wiring would hold up to Silverstar bulbs. I initially upgraded to an H4 bulb but even that got too hot for the standard wiring. I tied in relays with 14 ga wires to the bulbs after the relay and I haven't had a problem since.

If you install a starter button, or even if you don't, a relay on your starter circuit will make your ignition switch last forever. I recommend a relay for hi-lo beam.

I do submit, if you use LED bulbs, the current draw is pretty low. Low enough that a relay becomes unnecessary.

I tend to use more relays than most guys. I like them and the fact that switches(even the new and cheesy Chinese ones) no longer get hot. But I'm the guy that has seven relays for turn signals and 4-way flashers.

DannyP posted:

But I'm the guy that has seven relays for turn signals and 4-way flashers.

Man I thought you were weight conscious with that car!

DannyP posted:

But I'm the guy that has seven relays for turn signals and 4-way flashers.

And I'll bet that your lights are bright, your wires are cool, and everything always works.

"I'm the guy that has seven relays for turn signals and 4-way flashers."

It's a good thing your engine makes lots of noise - all that relay clicking and klacking would drive me nuts.  

IIRC, I have 1 (original VW) relay for the directionals - but the VW emergency flasher switch (the real brain of the party) has something like 12 wires running to it!

Terry Nuckels posted:

Here, I took a photo of my JPS wiring under the dashboard:

In all seriousness, you will want to do a bit of upgrading to your wiring. John doesn't use relays and seems to be colorblind when connecting random devices like gauges, wipers, horns...

I can’t help but laugh every time I see this. 

It would be as funny if it wasn't true in a lot of our cars.....   

 I come across this over and over  not even asking myself ..why ?   The worst was a tie , someone had a large spool of red wire and used it up and the other "builder" had a large roll of white "zip" lamp cord.

I had to run to the bathroom and throw up after seeing that last picture, Alan!

Yes, everything works. And Ed, my car weighs 1483, just a tiny few pounds less than the old one.

How many birds live in that mess?

When I get one of those I give it 20 minutes to test for hots and grounds seeing where it does while counting fuses that pop. ...I had ( well Ed has now) a large pair of scissors to castrate any consideration of " making it work" all in all it's easier ( less time)  to run a new VS harness than it is to straighten out someone's mess.

Alan Merklin posted:

... all in all it's easier ( less time)  to run a new VS harness than it is to straighten out someone's mess.

I did this very thing yesterday on a Trane 5-ton gas/electric RTU. 

Klein dikes and T-stripper, Ideal crimp tool, and a full assortment of terminals. After that it’s just time.