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warning light hook up - hot oil temp
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gmach21
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Location: Naples FL
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PostPosted: Wed Oct 11, 2017 9:53 am    Post subject: warning light hook up - hot oil temp Reply with quote

Hello all

need help installing a separate warning light for hot oil gauge.

I just bought one of those hot oil sensors - dip sticks .(save my bug) And I would like to install it on a separate light. (not through the dummy light)

Not sure how to go about it..I'm kinda a newbie to my cars electrical system. But I'm really good at following instructions.....

I have the extra bulb and twist on bulb holder to install behind the speedo ..maybe using the ATF hole....(1971 ghia)

I emailed the company I bought it from...a few months ago...no response..☹️

any tips or input would be greatly appreciated..

Thanks in advance For your help

George
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scotty timmerman
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PostPosted: Wed Oct 11, 2017 10:42 am    Post subject: Re: warning light hook up - hot oil temp Reply with quote

you can use the atf hole if you have a 2 prong style bulb holder. the wire coming from the dipstick sensor will be the ground. so you will need power from the fuse box.
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PolarBearVW
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PostPosted: Wed Oct 11, 2017 1:30 pm    Post subject: Re: warning light hook up - hot oil temp Reply with quote

So based off these diagrams from 1971:
https://www.thesamba.com/vw/archives/info/wiring/70-71ghia.jpg
https://www.thesamba.com/vw/archives/info/wiring/71kg_fuses.jpg

You probably want to grab this off the secondary side of fuse 1 or 2.
Avoid fuses 9/10 as they are always hot (the side of the fuseblock with the most red wires). Good luck - there are lots of other systems fighting for +12VDC in that area : )

If you feel ambitious you could follow a trace from 1 or 2 and see if there is a +12VDC line on a device closer to the install point of your light. For instance there is a +12VDC that hits E15 (the rear defogger switch).

I can't imagine the current draw on a dipstick sensor is much, but a good engineer would calculate the maximum wattage on this circuit to make sure any series components are rated for the heat dissipation..etc.
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PolarBearVW
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PostPosted: Wed Oct 11, 2017 1:32 pm    Post subject: Re: warning light hook up - hot oil temp Reply with quote

edit - the draw would be from the light - the dipstick is just a switch that creates continuity to ground. My mistake.
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gmach21
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PostPosted: Wed Oct 11, 2017 1:36 pm    Post subject: Re: warning light hook up - hot oil temp Reply with quote

thank you both... i will definitely check today when i get home
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gmach21
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PostPosted: Mon Nov 06, 2017 11:34 am    Post subject: Re: warning light hook up - hot oil temp Reply with quote

Hooked it up this weekend and works like a charm... i used the empty slot behind the speedo for the ATF function... now it will light up red if it gets too hot..

Thanks again for your help (tjschmidty + scotty timmerman)
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PolarBearVW
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PostPosted: Mon Nov 06, 2017 1:56 pm    Post subject: Re: warning light hook up - hot oil temp Reply with quote

I might have to add one of these myself...after my 1974 get's back on the road this spring after a 19 year hiatus.
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