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Old 04-26-2016, 03:28 AM   #1
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Default Help! 1999 1900sr Engine and Electrical Problems

Hey guys! After scouring you guys website for a few days, I feel hopeful that you can help me, as you already have by past threads. Last year I bought a '99 1900SR. Its fitted with the 5.0 V8 Mercruiser with Thunderbolt V ignition.

Never have I actually jumped in this thing once, cranked it up, and thought to myself "Heck yea, I love my boat"... its been a pain since the first day.

Last season, my engine started to miss/backfire (Not sure how to tell the two apart yet) while cruising. It got so bad to where it was inoperable. I have since changed the dist cap and plugs, with a little improvement, but not for very long. Back to the misfiring. Have pulled my plug wires testing for spark and I get it on some wires, not on others.. It used to idle just fine, but when under a load, misfiring. Ive since had it in two seperate shops, both claiming they fixed it with a total carb clean, and timing realignment. Once out on the water again, idles fine, cruised fine for a few minutes, but anywhere in between wot and idle its missing like crazy.

Decided to throw my wakeboard on and test it. Pulled me up for about 1 minute and crapped out and died. Nothing since, not even a start.

Im sure I have missed a whole lot in this post, but is there anyone who can help me with this.

I am prepared to start troubleshooting my Thunderbolt V ignition system by way of threads Ive read on here, but when I got home today to start, I am not even getting power via my ignition switch. No alarm, no crank, no nothing. very frustrasting.

Please help!!! Maybe with you guys help, I can have a running boat again! Thanking you all in advance.
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Old 04-26-2016, 11:43 AM   #2
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Regarding the missing/backfiring: Remove fuel filter/water separator and pour it into a glass jar, let settle and look for water or particles. It sounds like bad gas, how old is it? Was the boat sitting before you got it as they may have stirred up crud in the tank?

Regarding not cranking; verify the kill switch on the helm control is in the run position. Also verify the engine breaker is set; red button. it's mounted on the engine near the harness plug. Harness plug can also come loose.

Post back after checking these.
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Old 04-26-2016, 12:26 PM   #3
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I sure will! On my way to work now but when I get off ill mess with it again
I know that the kill switch was not engaged, but I do not have a lanyard. I just have it flipped to the ON position. As far as the gas situation, I just replaced the water fuel seperator, and put fresh gas in it. I'll pull it today though! I'll send pics too
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Old 04-26-2016, 04:01 PM   #4
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Also the shift cable must be in neutral in order for the engine to crank. i.e. shifter in neutral or push button to disengage shift when advancing the throttle.

You probably know this but I have had folks who do not.
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Old 04-26-2016, 04:43 PM   #5
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Quote:
Originally Posted by mmwjr View Post
Also the shift cable must be in neutral in order for the engine to crank. i.e. shifter in neutral or push button to disengage shift when advancing the throttle.

You probably know this but I have had folks who do not.
I've seen situations where you have to turn the shutoff off and then on again, like it was in on position, but not making contact.

I've seen the same with the shifter looking like it was in neutral, but still actuating the starter 'interupt'. Shifting it into gear, then back into neutral can fix that issue too.
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Old 04-26-2016, 10:14 PM   #6
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I'm getting nothing at my key... Reading 13v at the wire on back of ignition, but nothing when I turn key, or even jump hot to ignition. Not turning over, nothing....
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Old 04-27-2016, 12:50 AM   #7
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So power on the B terminal of the ignition switch, correct?

When holding the key in the start position do you get power on the S terminal?

When the key is in the run position do you get power on the I terminal?

B for battery, S for start, and I for ignition.

If these are ok then you need to see if the slave soleniod is getting power on the low current terminals. If not the neutral safety switch is open or faulty.

If you are getting power to the slave soleniod and it is not closing, clicking it's either bad or you battery is not providing power under load. Measure the battery to see if the voltage drops when someone try's cranking the engine.
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Old 04-27-2016, 01:45 AM   #8
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Thank you shrew and mmwjr. After a little messing around and checking terminals in my dash, the problem has corrected itself, or I fixed it when I rewired my radio the correct way, rather then splicing into the first hot I found (omw to lake last season in a hurry, amateur boat owner). Also, as far as the engine I concerned, I started checking plug wires and plugs and found one loose at the plug on my engine. She is purring and driving somewhat nice. After taking her out for a spin she performed well, with one minor miss/ backfire at first, with none to follow. I only ran her for about 20 mins though... Would that be normal?

Also, I notice someone has piggybacked the two wires that are on the starboard side of my engine located at my oil pressure sensor maybe. I plugged the wires back into the sensor, but got no gas from fuel pump when turning boat on. Replaced the piggyback and she gassed right up? Any comments??

Thank you guys!
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Old 04-27-2016, 01:58 AM   #9
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If the initial backfire was when the engine was cold the choke may be a little sticky.

You have an electric fuel pump, that is a safety switch that opens if the oil pressure is low. It's bad and should be replaced. With the jumper in place the fuel pump will continue to run if the engine stalls and may result in fuel overflowing the carb and a fire may result.

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Old 04-27-2016, 02:32 AM   #10
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Thanks Mike. Ill have to get me a new one soon.

What is the difference between a miss and a backfire? Would I be able to tell the difference in the two sounds?
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