Classic Mustangs (Tech) Technical discussions about the Mustangs of yester-year.

solenoid and coil

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Old Aug 18, 2010 | 06:21 PM
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1967coupeon101's Avatar
1967coupeon101
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Default solenoid and coil

When I try to start my 289, the solenoid and the ignition coil make a weird buzzing sound, almost like a faint tattoo gun sound. Its not that loud, you need to put your ear up to each unit to really tell its coming from them. I have to disconnect the oil pressure sender/coil wires for it to stop...

Anyone ever heard of this? Just yesterday i started it up for the first time and it seemed fine!
Old Aug 18, 2010 | 06:52 PM
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oh, i know you all love as many details as possible.. so all it does is buzz. Nothing else as though the car is dead. no spark, no starter. nothing. just that buzzzzzzzzzz
Old Aug 18, 2010 | 11:09 PM
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Is the battery charged? Did you try jumping the two terminals on the solenoid or just turning the key?
Old Aug 18, 2010 | 11:37 PM
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?

With a MULTIMETER, check your voltage at the battery, and at both sides of the solenoid both when trying to crank the car and not trying to crank the car.

The first theory I come up with is that your starter has a dead short or is stuck tight, just a guess though. The voltage readings will help to prove or disprove this.
Old Aug 22, 2010 | 09:23 PM
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ok forget that buzzing sound, thats gone now. but i still get nothing when I try to start it. Its just frustrating because it came to life for a second before it did this... the starter is not stuck, i took it off then put it back on. Could it be the starter relay itself? or a blown fuse (someone at work mentioned fuses) Everything was cool until it fired for a sec
Old Aug 23, 2010 | 06:39 AM
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http://www.gascc.ie/index.php?option...tid=44:cattech

best of luck
Old Aug 23, 2010 | 09:42 AM
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Originally Posted by 1967coupeon101
ok forget that buzzing sound, thats gone now. but i still get nothing when I try to start it. Its just frustrating because it came to life for a second before it did this... the starter is not stuck, i took it off then put it back on. Could it be the starter relay itself? or a blown fuse (someone at work mentioned fuses) Everything was cool until it fired for a sec
Hook a jumper cable (I mean a SET of jumper cables, a little jumper wire will get red hot "right now") to one side of the solenoid (big wire), and touch the other end of the cable to the OTHER SIDE of the solenoid (The other big wire), if ALL OF YOUR BATTERY CABLE CONNECTIONS are good and clean the starter will turn the engine at least some (depending on the quality of your jumper cables).

If the engine turns, your problem is from the solenoid back to the car, if it still does not turn the problem is between the solenoid and the starter.

Oh when you touch the cable, there should be a spark, you should be far enough from the battery to not have an issue, but wear safety glasses just in case, especially if you have been charging the battery very recently.
Old Aug 24, 2010 | 07:49 PM
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when I tried the jumper cables, all the solenoid/relay did was spark big and loud and smoked a little. nothing else. Its the same when I touch the battery to "I" on the relay, only the spark is much smaller
Old Aug 25, 2010 | 04:55 AM
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when you are sure that your engine actually turns (try turn manually) then check that the positive wire from the selonoid to the starter is not hitting ground anywhere.
I've seen it twice already that the end of the cable that attaches to the starter was actually hitting the starter housing as well.
From your description that cable seems to short out to ground.
check on that next

cable should attach to that screw, but the cable at front is usually big and might hit the hosuing itself somewhere

kalli

Last edited by kalli; Aug 25, 2010 at 04:58 AM.
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