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Author Topic:   I keep frying ignition modules
CrazyT
Dirt Forum Racer

Total posts: 79
posted September 03, 2005 07:19 AM  
I have 355 with hei distributor with a napa pickup coil and msd coil i have been buying the msd look alike modules from motorville in KC. The first one i ran in hotlaps and the heat race and the first lap of the feature i ****ped out. I recieved a replacement and ran it the other night and it ran hot laps and the first lap of the heat when i picked up the throttle in the center of turn one it died and then refired and never gave anymore trouble, but being leary i changed it out for the feature. I run a stock module and i don't have any problems, but put the good one in and it runs better but if it won't stay running that doesn't do me any good. The last module you can see where it melted the power transistor our and the spade terminals showed heat on the solder joints where the pickup coil plugs in. I also run an alternator so it has good voltage. I am trying to figure out if i have a problem or if i am getting bad modules.

racer17j
Dirt Forum Champ
Total posts: 5390
posted September 03, 2005 07:59 AM  
I didn't use grease on the last one, but on the first one i used some heat sink grease that i had. I called motorville and they said that i didn't have to use the grease which i thought was strange. The engine has solid mounts and i am grounded at the back of the block at a transmission bolt. I thought about the ground being a problem and i have made a ground strap to go from the engine to the frame. I guess i will see what happens on the next module.

Thanks

redneck racing
Dirt Forum Champ
Total posts: 860
posted September 03, 2005 07:21 PM  
I grounded from the tranny bolt to the front bay, used stock modules with no grease and never fried one. Eddie

joetaylor
Dirt Forum Champ
Total posts: 640
posted September 03, 2005 08:57 PM  
good idea to ground the dist to the block

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if every thing is under control your not fast enough

CrazyT
Dirt Forum Racer

Total posts: 79
posted September 04, 2005 06:52 AM  
How does everybody wire their alternator? I have a 3 wire alternator and the way i wired it, you turn a switch on and the alternator is charging as hard as it can. I usually turn the switch on under caution. I have never had a problem with it, just wondering if it cause my problem.


MTB
Dirt Newbie

Total posts: 1
posted September 04, 2005 06:09 PM  
If the alternater is running full open?? You might be putting bout 17 volts into your system witch could fry the mod. Check at the battery with a voltmeter while chargeing and see what the voltage it is at.
Loose connections can also cause problems, heating up or burning. they pull more amprage then tight connection.

MTB

iowa_dirt_track_girl
Dirt Freak

Total posts: 461
posted September 04, 2005 09:52 PM  
we fought this problem once before we had a switch on the alternator so we could turn it off on the last few laps to see if it made a difference wich it didnt BUT when we would turn it back on I dont remmeber exactlly what the guys said but it was something about a energy spike.

I know that DUI makes a module that is good up to 18 volts and it is stock appering

Eljojo
Dirt Forum Champ
Total posts: 968
posted September 05, 2005 04:43 AM  
When you kill the motor with the main switch, intead of a switch going only to the distributer, the alternator will spike. Usually it takes out the tach, but I can see it frying the module.

racer17j
Dirt Forum Champ
Total posts: 5390
posted September 07, 2005 06:19 PM  
I had a problem poppping modules last year.

I can't say definitive that I found the problem, but regrounded my tach better and it never occurrd again.

    

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