Adding a Relay to the Turn Signals? (Page 2) : MGB & GT Forum : MG Experience Forums : The MG Experience

Re: Adding a Relay to the Turn Signals? #21
Ogre1 Allan Ogilvie Melbourne Victoria, Australia 1977 MG MGB "Greenb"	Posted: August 29, 2012 06:59PM Registered: 2 years ago Posts: 1,332

Don't bother, the indicators don't draw enough current to warrant it. Start with the hi current draw items and move down:
Horn, Rad fans, head lights etc. If your concerned about current load then LED bulbs are getting better and draw less than 25% of the load of an incandescent globe. The only issue you will have is the flasher can not getting enough juice but you can correct this with resitors in series with each light.

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Re: Adding a Relay to the Turn Signals? #22
Simon Simon Clowes Salem , Oregon, USA 1979 MG MGB "Big Red"	Posted: August 30, 2012 08:33AM Registered: 14 years ago Posts: 7,508

In reply to # 2157256 by Ogre1 Don't bother, the indicators don't draw enough current to warrant it. Start with the hi current draw items and move down:
Horn, Rad fans, head lights etc. If your concerned about current load then LED bulbs are getting better and draw less than 25% of the load of an incandescent globe. The only issue you will have is the flasher can not getting enough juice but you can correct this with resitors in series with each light.

If you are going to place resistors in series with each LED, why both replacing the lights for low current drsaw LEDs?? The resistor is going to increase the current draw back to where it was with incandescent lights.

LED really need the low current electronic flasher can.

1979 Roadster (Big Red) daily driver.
unknown GT somewhere in the future.
09 Accent

Don't got to bed made - stay up all night plotting revenge

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turn signal works on right, but not on left? #23
MickMoynihan Mick Moynihan Bellingham, Wa, USA	Posted: August 30, 2012 04:56PM Registered: 8 months ago Posts: 3

I have a 1977 MGB and the turn signals work when I turn right, but there is nothing when I turn left. I checked the bulbs and they seem to be just fine. any ideas? Are there two flashers on the car? where are they located?

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Re: Adding a Relay to the Turn Signals? #24
hsim4mahgod Michael Breeman Sunshine Coast Queensland, Australia 1977 MG MGB	Posted: August 30, 2012 05:28PM Registered: 1 year ago Posts: 301

In reply to # 2157620 by Simon

In reply to # 2157256 by Ogre1 Don't bother, the indicators don't draw enough current to warrant it. Start with the hi current draw items and move down:
Horn, Rad fans, head lights etc. If your concerned about current load then LED bulbs are getting better and draw less than 25% of the load of an incandescent globe. The only issue you will have is the flasher can not getting enough juice but you can correct this with resitors in series with each light.

If you are going to place resistors in series with each LED, why both replacing the lights for low current drsaw LEDs?? The resistor is going to increase the current draw back to where it was with incandescent lights.

LED really need the low current electronic flasher can.

Fitting resistors defeats the efficiency of LEDs which draw little cuurent. The resistors will require alteration to the indicator light circuit which can add to future failures. Just buy a direct replacement electronic flasher, fit LED bulbs and you will have a reliable efficient indicator lights set up.

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Re: turn signal works on right, but not on left? #25
hsim4mahgod Michael Breeman Sunshine Coast Queensland, Australia 1977 MG MGB	Posted: August 30, 2012 05:40PM Registered: 1 year ago Posts: 301

Does your vehicle have a hazard warning flasher and if so does this work ie all indicator lights flash on and off. If not then the fault may be in the hazard flasher switch, but if they do all flash in hazard mode then your fault will more than likely be in the bullet connectors in the LHS circuitry. Should be a relatively easy fix especially if you have a multi-meter or test light. Download the appropriate electrical diagram from "Auto-Wire" to make your task so much easier. Good luck, Mike

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Re: turn signal works on right, but not on left? #26
MickMoynihan Mick Moynihan Bellingham, Wa, USA	Posted: August 30, 2012 06:22PM Registered: 8 months ago Posts: 3

yes, the four-way flashers do work, so I will follow your advice and chase it down. It should not be too much of a problem. The schematic is helpful. Mick

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