for some reason, when i pull hazard switch, my fuel pump goes on (flashes on off), - carbed v8 Options

[Spoke]

JIM: WITH KEY OFF AND HAZARDS PULLED, LIGHTS BLINK AS THEY SHOULD AND FUEL PUMP GOES ON AND OFF WITH LIGHTS. WITH HAZARDS NOT PULLED, BUT IGN KEY ON, FUEL PUMP RUNS STEADY. I HESITATE TO SEE WHAT HAPPENS WITH KEY TURNED AND HAZARD SWITCH PULLED.

Spoke: Ok, so the pump cycles with the lights ON/OFF... Then the 2 relays on the relay board should be turning off and on too. Can you check this? By placing your hand on the relays, you would be able to feel the relays click on and off. Do this for both relays.


Spoke: Try this, key off, flasher on. I think you said the FP runs, correct? Remove the 2nd relay looking from the rear of the car. Counting relay sockets here. Does the FP still run? Trying to see if you have a short in wiring to the FP. Also is the FP in the front of the car?

JIM: DID THIS AND FUEL PUMP DID NOT RUN.

Spoke: This tells us that the relays are doing what they should but the power to the relays is being pulled up by the flasher. If so, this would be pin 8 on the 14 pin connector.

[Spoke]

seems my 14 pin plug has power at 12 and 14 pins with key off.

with ignition key turned, 12, 14, and 8 and 3, have power.

I was expecting one pin to flash with the hazards but none did. but I guess without plug connected to relay panel, that was an ill conceived expectation.

pins 11 and 6 are empty.

its got to be how I wired my fuse box???

Pin 12 and 14 come directly from the battery w/o fusing.

Pin 8 should be connected to the one side of fuse 9. There are 2 wires on this side; the other wire comes from the ignition switch. This path also has no fusing. 8 should be ON with key on and off with key off.

pin 8 provides power to the power supply relay which itself provides power to the FP relay.

With key off and flashers on: pin 8 voltage should be 0V and not switching. What do you measure?

[jimkelly]

spoke Q: With key off and flashers on: pin 8 voltage should be 0V and not switching. What do you measure?

jim A: I do not have an ohm meter (seems like a must have tool) but will check pin 8 on the plug itself for 12v this morning as you suggest and report back. thanks!

[Spoke]

spoke Q: With key off and flashers on: pin 8 voltage should be 0V and not switching. What do you measure?

jim A: I do not have an ohm meter (seems like a must have tool) but will check pin 8 on the plug itself for 12v this morning as you suggest and report back. thanks!

How did you measure voltages before? If you have a small lamp like a dash indicator with socket and wires hanging, this will do for a voltmeter.

[jimkelly]

I have been using a headlight and some long wires : )

but I broke out my low budget volt meter and , drum roll please.

I am getting surging power at pin 8 on the 14 pin harness when hazard switch is pulled and no key in ignition.

so clearly the flashing power is coming thru the tunnel harness, I need to see the color of the wire on 14 pin harness, pin # 8. appears to be a black wire.

note too that I have all my gauges out at the moment.

video

https://www.youtube.com/watch?v=kw_PQ0eghn4

[rhodyguy]

what happens when you disconnect the flasher relay?

[jimkelly]

where is flasher relay? is that the one under the dash but not on fuse panel?

[rhodyguy]

looking in aa catalog for the #, not sure of the actual physical location. maybe unplug the switch? don't know if that would affect other circuits. tom (local guy) is the electrical ace.

[Spoke]

I am getting surging power at pin 8 on the 14 pin harness when hazard switch is pulled and no key in ignition.

OK, this is good. So the wiring in the engine compartment is ok, relay board ok.

The black wire from pin 8 to the interior should connect to fuse 9 of the original car. Not sure where it goes on your car. You gotta find that wire and where it goes in and around your fuse box.

Also locate the flasher. You might be able to find it easier by letting it flash and listening for the clicking.

[rhodyguy]

and prob feel the click while activated.

[jimkelly]

I will trace the black wire. I tried to feel clicking but could not, i'll have to get my ear up closer to relays, or pull each till I find the right one. thanks (IMG:style_emoticons/default/smile.gif)

ok, I hooked up a D cell battery to some wires and my volt meter, I plugged one end into 14 pin harness #8 pin, and at fuse panel I got continuity at #9 on bottom (2 black wires, bundled) and on #9 at top (black/yellow [can't see it in pic] and 2 red/whites, bundled). the 9th fuse, a 7.5 amp, before the 20 amp.

its a little confusing determining which is #9, as this fuse panel does get mounted upside down, but right side up if you laying on the floor pan with head looking up under dash.

oops, forgot, need to find my flasher relay.

[rhodyguy]

if you haven't found the hazard system in the 'book' its on p129 sec 26. reads to me as tho the flasher is tied to the signal relay(?) or signal and flasher are the same relay? pretty straight forward "Fault finding".

[jimkelly]

but where does it cross over into my fuel pump harness?

honestly, relay seems to work fine.

do you think within the relay power can be crossing over to my fuel pump harness?

jim

[jimkelly]

all 4 relays out - and hazards still work and FP still goes on and off.

so, could I have a short in a relay holder?

[rhodyguy]

don't have the computer skills to point to something. just above the second round relay recepticle from the right, there looks like a chaffed wire with strands sticking out. am i seeing that right?

[rhodyguy]

hot wire the pump? switched fuse (cig lighter?), long temp wire to + pump terminal and temp ground to chassis. see if the flashers still flash. when the pump is activated you don't hear gurgling, not normal pump buzz, sounds do you?

[jimkelly]

yes - good eye. I noticed two weak female connectors to my fuse box, I had replaced one this morning but neglected this one, which I just changed now.

I also swapped out both relays on relay board, no change.

[rhodyguy]

ok, brown/ground. what does the fuse it goes to control? i don't understand how the flashers and whatnot can function with the relays removed.

[jimkelly]

the wire went to this fuse. this is the other side wire I fixed earlier today. its #7 slot on fuse box.

I assume the flashing mechanism is actually in the hazard switch?

[Dave_Darling]

Brown should never connect to a fuse. Ever.

The flasher relay is not one of the round relays. It is a square one--either the silver one in your pic (or that might be the high/low beam relay?) or a different one. I remember that the one in my car is a taller rectangular black plastic box, but it was on the top side of the stock fuse box.

Keep tracing wires, or possibly listening for the clicking when the lights are blinking.

--DD