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So I have finished up my ls swap rebuilt 5.3 lm7 in a Plymouth duster with a 76/75 precision turbo and an FTI th400. Everything is running off a terminator x. Car was running well for a week. Then the alternator bearing started squealing (it was the one thing I kept from the junkyard after the rebuild) so I figured I’d replace it swapped out an alternator with a rebuilt unit of the same amperage.
After swapping the alternators I started her back up and she was running great. Jumped in to go for a drive and didn’t get but a few hundred yards before she stalled out. Every time it stalls out it starts up again no problem but there’s really no telling how long it’ll run again before it dies again. Sometimes a few miles. Sometimes a half hour later.
maybe some useful info.
Battery is relocated to the trunk. I’m grounded to the subframe in both places. I checked voltage at the alternator and the batter there was .3 voltage drop. Didn’t seem enough to cause these issues.
fuel cell with walbro340
After a few drives this alternator seems to be squeaking on me now too. is it a belt issue? Too tight or loose and slipping.
I’ve had it die under heavy throttle and idle.
with every accessory running I’m still reading 13.2 at the battery.
I’ve confirmed my 12v sources for Holley and main power is direct to the battery.
is this maybe a relay issue? Fuel pump?
haven’t been able to find any loose connections anywhere really. I’m not sure what changed in doing that swap that made this issue show up. I enjoy the tediousness of electrical work but am learning as I go and I’m not fully sure where to look next. Any help or direction would be greatly appreciated.
To me, 13.2v seems low. What's the amperage of the alternator? Whats the voltage at the fuel pump when running? Where are you taking fuel pump power from? With a trunk mounted battery, best to take it directly from the battery. I had a low fuel pressure issue until I moved the fuel pump (walbro255) power, relay, and fuse to the trunk. That solved my problem.
How about an update. Inquiring minds want to know!
my apologies. After a drive I had alot of heat in the fuel pump relay so I wired in a higher amperage relay and seemingly the problem disappeared.
The only other thing I had done was pulling and reuploading the .gcf file as someone in another forum had suggested maybe it got corrupted in some way because I disconnected the battery before swapping the alternator.
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Stalling issue while under diff 
