Does anyone know what are common causes of blowing the fuse on the engine relay board for the fuel pump and how to diagnose it? Would a bad fuel pump cause this?
Thanks,
The most common cause is that the aux air regulator wire is shorting to ground. Either where the wire goes into the bottom of the "can", or the wire is unplugged and touching ground that way.
--DD
Thanks Dave. I'll check it out this morning.
SDR
Kind of worked. I disconnected the Aux Air valve connector and electrical taped the ends. Car fired right up. Drove about a mile and a half and the fuse blew again. Do you have any other suggestions of where to look?
Thanks,
SDR
If I'm reading the schematic correctly, there should be a 25 amp fuse. Is that correct? Mine had a 16 amp.
SDR
The low-rating fuse is the probable cause, but check the path for corroded connections as well. Corrosion on terminals will cause a higher current draw in a circuit.
But, also consider that the heater fan (decent amp draw) and AAR do share that current path. So, place in proper rated fuse, check all wires at those two pieces, and relax
Thank you...thank you!! Just ran into this problem yesterday and was about to have the car towed. It was that little little wire not protected underneath the auxiliary air valve. Love this forum...you guys are the best!
SDR,
A lot of folks started using a 16 amp fuse in that spot. Unless you have the rear window defrost, a 16 amp is adequate. That fuse protects ( used loosely ), the following; fuel pump - about 5 amps, heater fan - about 5 amps, rear window defroster Don't know the amps for this. and last the AAR - about 1 amp. So if you are not using or don't have a rear window defroster, your normal draw max would be about 11 amps. No reason a 16 amp would not be enough. If you have been running a 16 amp for some time and have no rear window defroster, you have something else going on. Putting a larger fuse in could lead to overheated wires on the circuit that is causing increased current flow.
The wires for the AAR are sized for about 10 amps max continuous. If the wire to the AAR starts to short to ground and causes increased current flow, this has happened to several members here, it can cause a fire in the ignition harness. With a 16 amp fuse being used and the fuel pump running, there is a better chance that the fuse will blow before a fire starts. Every member that had a fire caused by the AAR was using a 25 amp fuse. Had they been using a 16 amp, the outcome might have been different. The other thing that you can do is run a 25 amp but install a 5 amp in-line fuse where the AAR plugs into the harness wiring.
Tom
A bad ground will tend to cause an increase in current draw as well. Make sure all your grounding points are clean and have tight connections.
Where is the aux air regulator wire located. I’m having the same issue keep blowing fuses. Also I noticed in my Manuel it calls for a 30 amp fuse is this correct? Thanks in advance
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