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Old 02-16-2011, 09:02 AM   #1
morgman
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Auto Electrical: How to test a flasher relay?

So my left signal became intermittent for a while and then stopped working altogether. Mazda wants $63 for a flasher relay, Lordco $23. Neither will take a return on electrical.

I'm wondering if I can test this with my multi-meter. The flasher relay appears to be twice as wide as a normal relay. Car is a Mazda Precidia, and I don't have the service manual.

Symptoms: On left signal flasher ticks at double speed as if a bulb is burnt out, but no flashing whatsoever happens at the bulbs. Right signal everything works normally. 4-ways flasher goes normal speed but only the right side flash.

Thanks NBR!
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Old 02-16-2011, 09:22 AM   #2
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You should be able to hear the "clicking" in your dash when the left turn arrows are flashing. That clicking is the relay obviously which means it is working. My guess would be the connection from the relay on to the left side bulbs is wrecked, cracked or grounded wire etc. I would have to look at a wiring diagram to diagnose better though.

If you can figure out which wire is the power wire feeding the bulbs, use a multimeter to see if you have continuity between the relay end and a bulb end and check to see if you have continuity to the chassis fom the relay end of the wire, this could indicate a short.
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Old 02-16-2011, 09:39 AM   #3
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check connections on relay and bulbs, could be as simple as corrosion.

I only know this as an experienced wiggle mechanic...wiggle things till you figure it out.

Last edited by Bushman; 02-16-2011 at 03:04 PM.
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Old 02-16-2011, 04:03 PM   #4
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1. Remove relay

2. Set your multimeter to the ohmeter setting and check the resistance across the power terminals. There should be no continuity.

3. Now use some jumper wire to hook the relay up to a car battery. Positive battery terminal to a control terminal on the relay. negative to the other control terminal on the relay.

4. check continuity now. The relay should have went click when you hooked it up and you should have continuity betweem the power terminals on the relay.
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Old 02-16-2011, 04:25 PM   #5
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Oh yeah and in my experience most Auto relays are really generic and can be bought from any electronics supplier like MRO on Boundary for about 10 bucks. Or call North Shore Autoparts and tell them you want the shady tree mechanic deal. They call it the VIP discount. That usually gets you a price that's half of what Lordco charges.
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Old 02-16-2011, 04:29 PM   #6
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I think both bulbs on the left side need to be replaced.
Swap out the left and right side bulbs, see the problem jumps to the right side(Check for corrosion on the left side contact points when you do this).
If not its probably the relay.
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Old 02-19-2011, 01:20 PM   #7
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So are your blinkers blinking yet?


Whats the diagnosis...lupis?
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Old 02-19-2011, 05:59 PM   #8
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I pulled the left front bulb and replaced it, as that was easiest to get at. No change. Haven't found time to pull the relay out and test it, but I've got to put in a couple new exhaust parts next week so I'll give it some effort then.
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Old 02-19-2011, 08:45 PM   #9
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fuckwith bulbs/bulb holders /wiring ,replace relay ,replace steering column switch in that order ,the 1st 2 are fairly cheap n easy ... the last one is not
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Old 02-19-2011, 08:50 PM   #10
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Check blinker fluid levels.
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