Ignition Switch Relay revisited

[Anonymous]

OK, Gentlemen, I'm convinced that I need an ignition switch relay. I just checked and I'm losing at least one volt at any speed or even with the engine off. The big question now is what kind of relay has been used? I bought some Potter Brumfield plug-in type that has DPDT 15 amp contacts that I planned on connecting in parallel to get a 30 amp capacity....then I saw an automotive big hulking metal enclosure that looked invincible holding dual SPST fused 30 amp relays. How far should I go?

Along with the recommendation for 10 ga. ground wiring to the body,engine,fuse block and regulator: I plan on reducing the tangle of wires to the battery negative terminal by series wiring them all.

Think Spring!

[focus frenzy]

you can use whatever relay you desire, the only require ments are, that it fit in the limited space available, have at-least a 15 amp rating (and that is flexible), and be a continuous use type relay.
I suggest using radioshack relay #275-226, it has a 30 amp rating, spst contacts, is relatively compact, and comes with a mounting ear.
a potter&brumfield vf4-15f11-z01 relay will work just fine and can be found at any auto parts dealer, you can also get a fog/driving light relay, they are basically a p&b relay with the mounting ear and don't have the unused (for this mod) 87a terminal.

you will be amazed at the difference 1 volt has on the brightness of the headlight!
I also have a micro relay wired to cut the headlight when the starter is engaged, freeing up 55 watts for the ignition and starter.

[Anonymous]

Link for Bosch relay

Here is a link for a site that has Bosch relays (what you need) for cheap.

http://www.partsexpress.com/pe/pshowdetl.cfm?&DID=7&Partnumber=330-070

[saaz]

I agree with focus. I have run a 20amp relay for more than 15 years. It reduces the losses through the ignition switch. I also put a relay in the lighting circuit of the stator, as it goes up through that little light switch and back again. And of course high and low beam....

[SqDancerLynn1]

Installing a relay is The best upgrade you can do for your electrical system

[Anonymous]

I had just gotten a new one off Ebay for mine. the old one worked fine but it was the last item of the old electrical system I wanted replaced. I like the fact that the old 79's had the ability to turn off the lights separately. Yes it does make a difference to the battery.