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PV, 120 (Amazon), 1800 General Forum for the Volvo PV, 120 and 1800 cars

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Fog lamp question

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Old Dec 27th, 2010, 15:03   #11
Ron Kwas
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Woodman;

The Holden fixture mounted above bumper looks nicely suited, and at a modest 20W, a relay is not even an absolute requirement...but I would still add it because for the suggested wiring (see wiring diagram I've just added to Lighting Tech Article at: http://www.sw-em.com/lighting.htm#su...t_wiring)...it keeps the wiring running to the dashboard nice and simple...a single control wire to chassis, and a further wire to power the indicator (low side of indicator connects to chassis).

The indicator could certainly be integral to the switch as Michael suggests (this has the added advantage in that it looks neat and tidy while using less dashboard real estate also)...be aware however that the indicator and switch circuits must be separate for this particular application...I seem to recall that on a lot of the indicating switches, the indicator circuit is tied to the switch (watch for this when procuring switch, and only use one where this is NOT the case!).

Regarding the "Spare Wire" which was mentioned by Loon...this would indeed be handy to use...if you can't locate this spare wire in existing harness, you will need to run a new one which would be a bit of a pain (enclose in protective sleeving!). I'm not certain that all Amazon harnesses had these...to determine if you have it in your vehicle, check at the main six pin connector at the boot hinge...you will see it coming out of the harness sleeve, unterminated and unused. If you find it there, great...you should be able to find its other end at the six pin connector under dash, where the harness departs up the A pillar and toward the boot.

In the suggested wiring...function is pretty much as explained in first post...some additional notes:

Power should be taken by way of a new fuse of suitable rating, from Battery plus post (or Starter Post)...in this way you wouldn't have the automatic Off function you would have it you took power from Ignition power Fuse2, for instance, but you also wouldn't be subjecting the vintage electrical components to any significant additional currents...this is an important consideration and much preferred from a reliability of existing components stand point!

Cheers from Connecticut!

[Woodman; TNX for nice comments.]

Last edited by Ron Kwas; Dec 27th, 2010 at 15:59.
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