5 terminal relay vs 4 terminal ??? - Chevelle Tech
Electrical & Wiring Troubleshooting electrical problems.

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post #1 of 2 (permalink) Old Sep 27th, 05, 9:05 AM Thread Starter
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5 terminal relay vs 4 terminal ???

I know by now you all are getting tired of my questions but I don't know the answers, obviously, and was hoping you would tolerate this electrically challenged persons questions once more.

I've read and done a search on relay's to brighten the headlights. Thought I had it figured out Alt/Bat power to term# 30, Switched power to term# 86, line out to headlights term# 87 and term# 85 to ground. Pull out the relays I purchased a while back(couple of years at least) and they have 5 terminals the above mentioned and the additional term# 87a.

Color code are as follows;

Term# 85 white(ground)
Term# 86 red(line from light switch, lt grn brights, tan lows)
Term# 87 green(line out to headlights lt grn brights, tan lows)
Term# 87a blue ???
Term# 30 black[power in from either alt or bat(jct block)]

The relays are Beuler 12V 40/50A BU-5083-0000

TIA Pete and Nicholas

Any help would be greatly appreciated.

Member# 1097
1970 Chevelle 350cu w/ th350, 750 edel carb, perform intake and lopey cam of unknown specs which produces low vacuum 7-9", otherwise stock motor.
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post #2 of 2 (permalink) Old Sep 27th, 05, 12:23 PM
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Re: 5 terminal relay vs 4 terminal ???

You've got it right, just don't use 87a. 87 is a normally open contact, no power out until you energize the relay. 87a is a normally closed contact, power out until you energize the relay. 87a is just the opposite of 87.


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